There weren’t any problems until some users requested they want to have this tab back.
I just changed Visible back to True and tab appeared obediently. So I saved customization and opened the form once again. The problem is that People tab is still invisible Even this didn’t help.
It desnn’t make sense to comment this code as I just added it to make tab visible.
Why I should expect diferent result than that when I didn’t have this method at all?
I think you misunderstood.
@pawel.malicki try saving customization with a different name. Recently I ended up re-doing entire customisation as customisation was referring to a deleted UD field even though it was not referred anywhere in the code.