@artolli Same thing here, I have to close my tabs from right to left or else Opera is crashing. Opera version 112.0.5193.0

Every time I try to use sync in opera it crashes after a few seconds. I even created a new opera account and logged in on my PC and Android mobile. At first it worked fine, but after a few minutes it crashed again, even when I deleted all the settings! I got it to sync, but I can't create a new account every time it crashes, so now I have to do it manually, every now and then exporting my bookmarks and passwords to a file (backup) and make changes on my Android phone - manually!
Very annoying and it should be fixed as many Opera users have had the same problem for years now.
The only thing I can do is stay logged in but not sync anything.