Not sure how I did that, but I cannot see the tab titles anymore. They are there, but have the same color as the background. I cannot see any variable to change in system settings. How can I reset that to default? Thanks in advance!
Odd. Are you switching OS modes? Even if not, I’d update to v.8.7.0 and try re-opening the doc. I’ve just tested and the tab’s text label does not use a colour from the doc (e.g. $Color or $NameColor) so it is a UI colour—thus my thought about light/dark modes.
If the problem persists, I’d zip the file and send it to support (firstname.lastname@example.org). I’m sure this is not supposed to happen.