@whiter1 ReEnabled a flags do nothing. I found a solution !.
Flags not fix, flags show the new settings who need to be set.
- opera://flags -> Search and Enable 'scrollable tab strip' -> Relaunch
This will show new option in settings as disable
- opera://settings -> Search 'interface' and enable "tab scrolling" -> wait 5sec or Relaunch
️ Done :).