diff --git a/docs/portal_config.md b/docs/portal_config.md
index b085cb7a8..9e422aec2 100644
--- a/docs/portal_config.md
+++ b/docs/portal_config.md
@@ -204,6 +204,7 @@ Below is an example, with inline comments describing what each JSON block config
     "studyRegistration": true, // optional, whether to enable the study registration feature
     "workspaceRegistration": true, // optional, whether to enable the workspace registration feature
     "workspaceTokenServiceRefreshTokenAtLogin": true, // optional, whether to refresh the WTS token directly at portal login (recommended mode). If not set, this refresh happens only when the user enters the workspace section of the portal (default/old/previous mode).
+    "legacyVADCDataDictionary": false, // optional, VADC specific. Set to "true" to ensure the new version of the /analysis/AtlasDataDictionary data dictionary is displayed the user navigates to /analysis/AtlasDataDictionary, and when the user clicks on the data dictionary button in when in the Atlas app page.
   },
   "dataExplorerConfig": { // required only if featureFlags.explorer is true; configuration for the Data Explorer (/explorer); can be replaced by explorerConfig, see Multi Tab Explorer doc
     "charts": { // optional; indicates which charts to display in the Data Explorer
@@ -749,7 +750,6 @@ Below is an example, with inline comments describing what each JSON block config
       "description": "My app description", // App title/name, also displayed on the App card in the /analysis page
       "image": "/src/img/analysis-icons/myapp-image.svg",  // App logo/image to be displayed on the App card in the /analysis page
       "needsTeamProject": true, // Optional. Whether the app needs a "team project" selection to be made by the user first. If true, it will force the user to select a "team project" first. See also https://github.com/uc-cdis/data-portal/pull/1445
-      "dataDictionaryVersion": "new", // Optional, for custom AtlasDataDictionary. Set to "new" to ensure the new version of the /analysis/AtlasDataDictionary data dictionary when the user navigates to /analysis/AtlasDataDictionary.
     },
     {
       "title": "My other app",
diff --git a/src/Analysis/AnalysisApp.jsx b/src/Analysis/AnalysisApp.jsx
index 6ae96918d..58aa48ec2 100644
--- a/src/Analysis/AnalysisApp.jsx
+++ b/src/Analysis/AnalysisApp.jsx
@@ -17,6 +17,8 @@ import CheckForTeamProjectApplication from './SharedUtils/TeamProject/Utils/Chec
 import TeamProjectHeader from './SharedUtils/TeamProject/TeamProjectHeader/TeamProjectHeader';
 import './AnalysisApp.css';
 import AtlasDataDictionaryButton from './AtlasDataDictionary/AtlasDataDictionaryButton/AtlasDataDictionaryButton';
+import AtlasLegacyDataDictionaryButton from './AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton';
+import isEnabled from '../helpers/featureFlags';
 
 const queryClient = new QueryClient();
 
@@ -139,7 +141,7 @@ class AnalysisApp extends React.Component {
       return (
         <div className='analysis-app_flex_row'>
           <AtlasDataDictionaryContainer
-            dataDictionaryVersion={analysisApps[app].dataDictionaryVersion}
+            useLegacyDataDictionary={isEnabled('legacyVADCDataDictionary')}
           />
         </div>
       );
@@ -168,7 +170,9 @@ class AnalysisApp extends React.Component {
         <React.Fragment>
           <div className='analysis-app__iframe-wrapper'>
             {this.state.app.title === 'OHDSI Atlas' && (
-              <AtlasDataDictionaryButton />
+              isEnabled('legacyVADCDataDictionary')
+                ? <AtlasLegacyDataDictionaryButton />
+                : <AtlasDataDictionaryButton />
             )}
             <iframe
               className='analysis-app__iframe'
diff --git a/src/Analysis/AtlasDataDictionary/AtlasDataDictionaryContainer.tsx b/src/Analysis/AtlasDataDictionary/AtlasDataDictionaryContainer.tsx
index 0c3465c8a..74be73e6a 100644
--- a/src/Analysis/AtlasDataDictionary/AtlasDataDictionaryContainer.tsx
+++ b/src/Analysis/AtlasDataDictionary/AtlasDataDictionaryContainer.tsx
@@ -1,21 +1,15 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { useLocation, useHistory, useRouteMatch } from 'react-router-dom';
-import ProtectedContent from '../../Login/ProtectedContent';
 import AtlasDataDictionaryLoading from './AtlasDataDictionaryTable/AtlasDataDictionaryLoading';
-import AtlasDataDictionaryButton from './AtlasDataDictionaryButton/AtlasDataDictionaryButton';
+import AtlasLegacyDataDictionaryButton from './AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton';
 import './AtlasDataDictionary.css';
 
-const AtlasDataDictionaryContainer = ({ dataDictionaryVersion }) => {
-  const location = useLocation();
-  const history = useHistory();
-  const match = useRouteMatch();
-
-  if (!dataDictionaryVersion || !dataDictionaryVersion.includes('new')) {
-    // Default legacy component: render a div with AtlasDataDictionaryButton when
-    // no dataDictionaryVersion is set or it does not include 'new':
+const AtlasDataDictionaryContainer = ({ useLegacyDataDictionary }) => {
+  if (useLegacyDataDictionary) {
+    // Default legacy component: render a div with AtlasLegacyDataDictionaryButton when
+    // useLegacyDataDictionary is set to true:
     return (
-      <div style={{ width: '100%' }}><AtlasDataDictionaryButton /></div>
+      <div style={{ width: '100%' }}><AtlasLegacyDataDictionaryButton /></div>
     );
   }
   return (
@@ -26,11 +20,11 @@ const AtlasDataDictionaryContainer = ({ dataDictionaryVersion }) => {
 };
 
 AtlasDataDictionaryContainer.propTypes = {
-  dataDictionaryVersion: PropTypes.string,
+  useLegacyDataDictionary: PropTypes.bool,
 };
 
 AtlasDataDictionaryContainer.defaultProps = {
-  dataDictionaryVersion: null,
+  useLegacyDataDictionary: false,
 };
 
 export default AtlasDataDictionaryContainer;
diff --git a/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.jsx b/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.jsx
new file mode 100644
index 000000000..10df10cf8
--- /dev/null
+++ b/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.jsx
@@ -0,0 +1,43 @@
+import React, { useState } from 'react';
+import { Modal } from 'antd';
+import Button from '@gen3/ui-component/dist/components/Button';
+import '../AtlasDataDictionaryButton/AtlasDataDictionaryButton.css';
+
+const AtlasLegacyDataDictionaryButton = () => {
+  const dataDictionaryURL = 'https://vincicentral.vinci.med.va.gov/SitePages/VINCI_University-VADC_Academy.aspx';
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const showModal = () => {
+    setIsModalOpen(true);
+  };
+  const handleCancel = () => {
+    setIsModalOpen(false);
+  };
+
+  return (
+    <div className='atlas-data-dictionary-button' data-testid='atlas-data-dictionary-button'>
+      <Modal
+        title="You're now leaving the VA Data Commons"
+        open={isModalOpen}
+        className='atlas-data-dictionary-button-modal'
+        onOk={() => {
+          window.open(dataDictionaryURL, '_blank');
+          handleCancel();
+        }}
+        onCancel={handleCancel}
+      >
+        <p>
+          The VADC website, privacy and security policies don&apos;t apply to the
+          site or app you&apos;re about to visit.
+        </p>
+      </Modal>
+      <Button
+        className='analysis-app__button'
+        onClick={showModal}
+        label='MVP Data Dictionary'
+        buttonType='secondary'
+        rightIcon='external-link'
+      />
+    </div>
+  );
+};
+export default AtlasLegacyDataDictionaryButton;
diff --git a/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.test.jsx b/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.test.jsx
new file mode 100644
index 000000000..5542142a6
--- /dev/null
+++ b/src/Analysis/AtlasDataDictionary/AtlasLegacyDataDictionaryButton/AtlasLegacyDataDictionaryButton.test.jsx
@@ -0,0 +1,19 @@
+import React from 'react';
+import { render, fireEvent } from '@testing-library/react';
+import '@testing-library/jest-dom/extend-expect';
+import AtlasLegacyDataDictionaryButton from './AtlasLegacyDataDictionaryButton';
+
+describe('AtlasLegacyDataDictionaryButton', () => {
+  it('renders the AtlasLegacyDataDictionaryButton component with an "MVP Data Dictionary" Button', () => {
+    const { getByRole, getByTestId } = render(<AtlasLegacyDataDictionaryButton />);
+    expect(getByRole('button')).toBeInTheDocument();
+    expect(getByRole('button')).toHaveTextContent('MVP Data Dictionary');
+    expect(getByTestId('atlas-data-dictionary-button')).toBeInTheDocument();
+  });
+
+  it('shows the Modal when the button is clicked', () => {
+    const { getByRole, queryByText } = render(<AtlasLegacyDataDictionaryButton />);
+    fireEvent.click(getByRole('button'));
+    expect(queryByText('You\'re now leaving the VA Data Commons')).toBeInTheDocument();
+  });
+});
diff --git a/src/Analysis/GWASApp/Components/Covariates/Covariates.jsx b/src/Analysis/GWASApp/Components/Covariates/Covariates.jsx
index 5fe7996e7..751ad9239 100644
--- a/src/Analysis/GWASApp/Components/Covariates/Covariates.jsx
+++ b/src/Analysis/GWASApp/Components/Covariates/Covariates.jsx
@@ -7,6 +7,7 @@ import queryConfig from '../../../SharedUtils/QueryConfig';
 import { useFetch, useFilter } from '../../Utils/formHooks';
 import { useSourceContext } from '../../Utils/Source';
 import SearchBar from '../SearchBar/SearchBar';
+import { addAriaLabelsToCovariatesTable } from '../../../SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/index';
 
 const Covariates = ({ selected, handleSelect, submittedCovariateIds }) => {
   const { source } = useSourceContext();
@@ -30,7 +31,9 @@ const Covariates = ({ selected, handleSelect, submittedCovariateIds }) => {
   );
 
   // remove already selected Covariates from list
-  const displayedCovariates = filteredCovariates.filter((x) => !submittedCovariateIds.includes(x.concept_id));
+  const displayedCovariates = filteredCovariates.filter(
+    (x) => !submittedCovariateIds.includes(x.concept_id),
+  );
 
   const covariateSelection = () => ({
     type: 'radio',
@@ -76,6 +79,7 @@ const Covariates = ({ selected, handleSelect, submittedCovariateIds }) => {
   }
 
   if (covariates?.status === 'success') {
+    addAriaLabelsToCovariatesTable();
     return (
       <div data-tour='select-concept'>
         <SearchBar
@@ -85,6 +89,7 @@ const Covariates = ({ selected, handleSelect, submittedCovariateIds }) => {
         />
         <Table
           className='GWASUI-table1'
+          onChange={addAriaLabelsToCovariatesTable}
           data-tour='concept-table'
           rowKey='concept_id'
           size='middle'
@@ -111,6 +116,7 @@ const Covariates = ({ selected, handleSelect, submittedCovariateIds }) => {
 Covariates.propTypes = {
   selected: PropTypes.object,
   handleSelect: PropTypes.func.isRequired,
+  submittedCovariateIds: PropTypes.object.isRequired,
 };
 
 Covariates.defaultProps = {
diff --git a/src/Analysis/GWASApp/Components/SelectCohort/Utils/CohortDefinitions.jsx b/src/Analysis/GWASApp/Components/SelectCohort/Utils/CohortDefinitions.jsx
index 9c453dc6b..b40d07d36 100644
--- a/src/Analysis/GWASApp/Components/SelectCohort/Utils/CohortDefinitions.jsx
+++ b/src/Analysis/GWASApp/Components/SelectCohort/Utils/CohortDefinitions.jsx
@@ -6,6 +6,7 @@ import { fetchCohortDefinitions } from '../../../Utils/cohortMiddlewareApi';
 import queryConfig from '../../../../SharedUtils/QueryConfig';
 import { useFetch, useFilter } from '../../../Utils/formHooks';
 import { useSourceContext } from '../../../Utils/Source';
+import { addAriaLabelsToCohortDefinationsTable } from '../../../../SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/index';
 
 const CohortDefinitions = ({
   selectedCohort = undefined,
@@ -48,26 +49,31 @@ const CohortDefinitions = ({
   ];
   if (cohorts?.status === 'error') return <React.Fragment>Error getting data for table</React.Fragment>;
 
-  return cohorts?.status === 'success' ? (
-    <Table
-      className='GWASUI-table1'
-      rowKey='cohort_definition_id'
-      size='middle'
-      pagination={{
-        defaultPageSize: 10,
-        showSizeChanger: true,
-        pageSizeOptions: ['10', '20', '50', '100', '500'],
-      }}
-      onRow={(selectedRow) => ({
-        onClick: () => {
-          handleCohortSelect(selectedRow);
-        },
-      })}
-      rowSelection={cohortSelection(selectedCohort)}
-      columns={cohortTableConfig}
-      dataSource={displayedCohorts}
-    />
-  ) : (
+  if (cohorts?.status === 'success') {
+    addAriaLabelsToCohortDefinationsTable();
+    return (
+      <Table
+        className='GWASUI-table1'
+        onChange={addAriaLabelsToCohortDefinationsTable}
+        rowKey='cohort_definition_id'
+        size='middle'
+        pagination={{
+          defaultPageSize: 10,
+          showSizeChanger: true,
+          pageSizeOptions: ['10', '20', '50', '100', '500'],
+        }}
+        onRow={(selectedRow) => ({
+          onClick: () => {
+            handleCohortSelect(selectedRow);
+          },
+        })}
+        rowSelection={cohortSelection(selectedCohort)}
+        columns={cohortTableConfig}
+        dataSource={displayedCohorts}
+      />
+    );
+  }
+  return (
     <React.Fragment>
       <div className='GWASUI-spinnerContainer GWASUI-emptyTable'>
         <Spin />
diff --git a/src/Analysis/GWASApp/Utils/constants.js b/src/Analysis/GWASApp/Utils/constants.js
index 243ad90fa..a9bb9bbed 100644
--- a/src/Analysis/GWASApp/Utils/constants.js
+++ b/src/Analysis/GWASApp/Utils/constants.js
@@ -19,7 +19,7 @@ export const GWASAppSteps = [
 export const MESSAGES = {
   OVERLAP_ERROR: {
     title:
-      'None of the persons in the (remaining) population of your selected cohorts overlap with the study population',
+      'One or more groups have no overlap with the (remaining) population of any of the other groups',
     messageType: 'warning',
   },
   NO_BINS_ERROR: {
diff --git a/src/Analysis/SharedUtils/AccessibilityUtils/AccessibilityCSS/AccessibilityGWAS.css b/src/Analysis/SharedUtils/AccessibilityUtils/AccessibilityCSS/AccessibilityGWAS.css
index 2ac34ec05..2b1431372 100644
--- a/src/Analysis/SharedUtils/AccessibilityUtils/AccessibilityCSS/AccessibilityGWAS.css
+++ b/src/Analysis/SharedUtils/AccessibilityUtils/AccessibilityCSS/AccessibilityGWAS.css
@@ -5,26 +5,37 @@
   border-color: #194C90;
 }
 
-.GWASUI-navBtn:not([disabled]):hover,
-.GWASUI-navBtn:not([disabled]):focus {
-  background: #2466AC;
-  border-color: #2466AC;
+.gwas-modal .ant-btn-primary:not([disabled]) {
+  background: #194C90;
+  border-color: #194C90;
 }
 
-.gwas-modal .ant-btn-primary:not([disabled]) {
+.gwas-modal .ant-btn-default {
+  color: #194C90;
+  border-color: #194C90;
+}
+
+.euler-diagram-controls .ant-btn-primary:not([disabled]),
+.euler-diagram-controls  .ant-btn-primary:not([disabled]):focus {
   background: #194C90;
   border-color: #194C90;
 }
 
-.gwas-modal .ant-btn-primary:not([disabled]):hover,
-.gwas-modal .ant-btn-primary:not([disabled]):focus {
+.euler-diagram-controls  .ant-btn-secondary {
+  color: #194C90;
+  border-color: #194C90;
+}
+
+.GWASUI-navBtn:not([disabled]):hover,
+.GWASUI-navBtn:not([disabled]):focus {
   background: #2466AC;
   border-color: #2466AC;
 }
 
-.gwas-modal .ant-btn-default {
-  color: #194C90;
-  border-color: #194C90;
+.gwas-modal .ant-btn-primary:not([disabled]):hover,
+.gwas-modal .ant-btn-primary:not([disabled]):focus {
+  background: #2466AC;
+  border-color: #2466AC;
 }
 
 .gwas-modal .ant-btn-default:hover,
@@ -32,3 +43,15 @@
   color: #2466AC;
   border-color: #2466AC;
 }
+
+.euler-diagram-controls  .ant-btn-primary:not([disabled]):hover {
+  background: #2466AC;
+  border-color: #2466AC;
+}
+
+.euler-diagram-controls  .ant-btn-secondary:hover,
+.euler-diagram-controls  .ant-btn-secondary:focus {
+
+  color: #2466AC;
+  border-color: #2466AC;
+}
diff --git a/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/SetDOMAttribute.js b/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/SetDOMAttribute.js
new file mode 100644
index 000000000..35b14db86
--- /dev/null
+++ b/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/SetDOMAttribute.js
@@ -0,0 +1,22 @@
+/*
+ * Used to update DOM attributes after component mounts
+ * example: useSetDOMAttribute('.ant-radio-input','aria-label', 'Select row for study population')
+ */
+
+const delayToAllowDOMRendering = 500;
+const SetDOMAttribute = (selector, attribute, value) => {
+  setTimeout(() => {
+    const elements = document.querySelectorAll(selector);
+    elements?.forEach((element) => {
+      if (element) {
+        element.setAttribute(attribute, value);
+      } else {
+        /* eslint-disable no-console */
+        console.error('Unable to find selector in setDOMAttribute: ', selector);
+        /* eslint-enable no-console */
+      }
+    });
+  }, delayToAllowDOMRendering);
+};
+
+export default SetDOMAttribute;
diff --git a/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/index.js b/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/index.js
new file mode 100644
index 000000000..1c7ec6ba7
--- /dev/null
+++ b/src/Analysis/SharedUtils/AccessibilityUtils/AntDAccessibilityFixes/index.js
@@ -0,0 +1,22 @@
+import SetDOMAttribute from './SetDOMAttribute';
+
+const addAriaLabelsToCohortDefinationsTable = () => {
+  SetDOMAttribute(
+    '.GWASUI-mainTable input.ant-radio-input',
+    'aria-label',
+    'Select row for study population'
+  );
+};
+
+const addAriaLabelsToCovariatesTable = () => {
+  SetDOMAttribute(
+    '.continuous-covariates-table input.ant-radio-input',
+    'aria-label',
+    'Select row for outcome phenotype'
+  );
+};
+
+export {
+  addAriaLabelsToCohortDefinationsTable,
+  addAriaLabelsToCovariatesTable,
+};