Hello. I had a problem after upgrading from version 5.8.7 to 6.2.1.1. When I updated and wanted to create a new group of fields, I could not edit it, all menu items were unclickable and the edit button also did not work. This works both with new fields and with previously created ones, I also cannot edit them.
The first thing I would suspect is a browser caching issue. Try clearing your browser cache.
The next thing I would suspect is that a file was corrupted during the update process. Try deleting and reinstalling ACF. No data will be lost as long as you did not save any changes while it was broken.
