Question about a feature in MO, I'm not sure what's going on, please answer!

[2190348114]

What does this option mean, please?
I accidentally clicked on this but didn't notice any changes to the game or mod files,
I'm a Skyrim player

[AnyOldName3]

It changes the last-modified time on all your BSAs to be a long time ago so the game thinks your loose files should be loaded instead. Generally, that's what you want to happen, but there are other systems, like Archive Invalidation, that can give you the same effect even if you don't press the button.