new sample script to update multiline text field

scripts/spo-multiline-field-properties/README.md

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+# Updating Multiline Text Field Properties in SharePoint
+
+## Summary
+
+Managing multiline text fields in SharePoint can be tricky, especially when certain field properties are not visible or editable at the library/list level, even though they are available at the site level.
+
+For example, at the **site level**, you can configure properties such as:
+- **Append Changes to Text**
+- **Number of Lines**
+- **Field Type**: Plain Text, Rich Text, or Enhanced Rich Text
+
+However, these settings may not appear at the **library/list level**
+
+![Example Screenshot](assets/multilinetext_appendtoText_library_missing.png)
+
+### Prerequisites
+
+- The user account that runs the script must have access to the SharePoint Online site.
+
+# [PnP PowerShell](#tab/pnpps)
+
+```powershell
+param (
+    [Parameter(Mandatory = $true)]
+    [string]$Url,
+
+    [Parameter(Mandatory = $true)]
+    [string]$ListName,
+
+    [Parameter(Mandatory = $true)]
+    [string]$FieldName,
+
+    [Parameter(Mandatory = $true)]
+    [ValidateSet("EnhancedRichText", "PlainText", "RichText")]
+    [string]$TextType = "EnhancedRichText",
+
+    [Parameter(Mandatory = $true)]
+    [ValidateSet("Yes", "No")]
+    [string]$AppendOnly = "Yes"
+)
+
+# Connect to SharePoint site
+Connect-PnPOnline -Url $Url
+
+# Map the TextType to corresponding RichTextMode and RichText values
+switch ($TextType) {
+    "EnhancedRichText" {
+        $RichTextMode = "FullHtml"
+        $RichText = $true
+    }
+    "PlainText" {
+        $RichTextMode = "Compatible"
+        $RichText = $false
+    }
+    "RichText" {
+        $RichTextMode = "Compatible"
+        $RichText = $true
+    }
+}
+
+# Convert AppendOnly parameter to boolean
+$AppendOnlyValue = if ($AppendOnly -eq "Yes") { $true } else { $false }
+
+# Update field properties
+Set-PnPField -List $ListName -Identity $FieldName -Values @{
+    AppendOnly = $AppendOnlyValue
+    RichTextMode = $RichTextMode
+    RichText = $RichText
+    NumLines = "6"
+    UnlimitedLengthInDocumentLibrary = $false
+} -ErrorAction Stop
+
+# Handle properties that cannot be updated directly
+$Field = Get-PnPField -List $ListName -Identity $FieldName -ErrorAction Stop
+$FieldSchemaXml = [xml]$Field.SchemaXml
+
+if ($TextType -eq "EnhancedRichText" -or $TextType -eq "RichText") {
+    $FieldSchemaXml.Field.SetAttribute("RichTextMode", $RichTextMode)
+    $FieldSchemaXml.Field.SetAttribute("NumLines", "8")
+}
+
+Set-PnPField -List $ListName -Identity $FieldName -Values @{
+    SchemaXml = $FieldSchemaXml.OuterXml
+} -ErrorAction Stop
+```
+
+[!INCLUDE [More about PnP PowerShell](../../docfx/includes/MORE-PNPPS.md)]
+
+***
+
+## Source Credit
+
+Sample first appeared on [Updating Multiline Text Field Properties in SharePoint Using PowerShell](https://reshmeeauckloo.com/posts/powershell-sharepoint-multilinefield-appendtext/)
+
+## Contributors
+
+| Author(s) |
+|-----------|
+| [Reshmee Auckloo](https://github.com/reshmee011) |
+
+
+[!INCLUDE [DISCLAIMER](../../docfx/includes/DISCLAIMER.md)]
+<img src="https://m365-visitor-stats.azurewebsites.net/script-samples/scripts/spo-multiline-field-properties" aria-hidden="true" />

scripts/spo-multiline-field-properties/assets/sample.json

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+[
+  {
+    "name": "spo-multiline-field-properties",
+    "source": "pnp",
+    "title": "Updating Multiline Text Field Properties in SharePoint",
+    "shortDescription": "Updating Multiline Text Field Properties in SharePoint",
+    "url": "https://pnp.github.io/script-samples/spo-multiline-field-properties/README.html",
+    "longDescription": [
+      "Managing multiline text fields in SharePoint can be tricky, especially when certain field properties are not visible or editable at the library/list level, even though they are available at the site level."
+    ],
+    "creationDateTime": "2025-05-07",
+    "updateDateTime": "2025-05-07",
+    "products": [
+      "SharePoint",
+      "Libraries"
+    ],
+    "metadata": [
+      {
+        "key": "PNP-POWERSHELL",
+        "value": "3.0"
+      }
+    ],
+    "categories": [
+      "SharePoint"
+    ],
+    "tags": [
+      "modern",
+      "Connect-PnPOnline",
+      "Get-PnPField",
+      "Set-PnPField"
+    ],
+    "thumbnails": [
+      {
+        "type": "image",
+        "order": 100,
+        "url": "https://raw.githubusercontent.com/pnp/script-samples/main/scripts/spo-multiline-field-properties/assets/preview.png",
+        "alt": ""
+      }
+    ],
+    "authors": [
+      {
+        "gitHubAccount": "reshmee011",
+        "company": "",
+        "pictureUrl": "https://avatars.githubusercontent.com/u/7693852?v=4",
+        "name": "Reshmee Auckloo"
+      }
+    ],
+    "references": [
+      {
+        "name": "Want to learn more about PnP PowerShell and the cmdlets",
+        "description": "Check out the PnP PowerShell site to get started and for the reference to the cmdlets.",
+        "url": "https://aka.ms/pnp/powershell"
+      }
+    ]
+  }
+]