I noticed the "Pin to Start" in Windows 10, when I select a file using "Pin to Start" it adds to the Start11 menu, additionally, I have the option to right-click the file to select "Unpin from Start" to remove the file from Start11 menu. In Windows 11 "Pin to Start" no longer works with the Start11 menu.

I understand "Pin to Start11" from Start11, but I noticed it doesn't update the file I pinned to the menu when right-clicking the file it keeps showing "Pin to Start11" instead of "Unpin to Start11".

Yes. I should clarify further about "Pin to Start11", while the file did get pinned to the Start11 menu when I right-click the same file again it will show "Pin to Start11" which will add the same file more than once. The file did not have an option to "Unpin from Start11".

From the Start11 menu, yes.

From the right-click menu on the file, no.

So I can not unpin the file within Windows Explorer on Windows 11? I was able to pin/unpin a file within Explorer on Windows 10.

Start11 does not offer unpin from the explorer folders, only pin.  This is how Start8/10/11/11v2 have all worked.

To unpin something from the start menu you would select it and pick unpin.

The exception is if something is pinned using Pin to Start rather than Pin to Start11 in which case it will change to Unpin.