I used the great scaling function in Cubase 15. But now an old project goes back to the old size repeatedly. So the window is bigger than the screen. It happens when I switch from notation view to editor view. I have to manually make the window smaller. But when I switch from notation view to editor view again, the window resizes again, too.
Hi,
which OS are you on, computer specs, graphic card & driver?
As a former beta tester you’ll surely understand that this info is needed as well 
macOS 26.1 (latest)
iMac (Intel) Retina 5K 2020
I was a Cubase beta tester in the 90ies, too.