could not find how to unfreeze rows
Use the ‘Freeze’ menu item a second time.
That doesn’t work for me. It seems that I have lost access to the leftmost column where you select an entire row, and that might be part of my issue.
What to do in case this menu item is unclickable? I need to edit my project but this option seems to be unavailable.
(Edit: spam-link removed -AK)