How to remove Folder as Test folder?

Hi all,
We did a cumulative patch upgrade V12 patch 19 to patch 23

Unfortunately we had selected a test test folder endpoint during the upgrade. Now I'm getting version errors as the particular test folder (PILOT) is on patch 19 whereas its reference folder (X3) is still on patch 19.

Tried everything. Unable to fix this.

Would someone assist to help with this? At this point we are unable to untick the test folder on Folders. (even if we changed as changeable in parameters)

TIA