Clicking one of the record modes buttons in the transport bar at the bottom of the Cubase window opens lists with several options. On my screen, the lower edge of those list boxes lies well below the edge of the screen. For the MIDI version, the last two options (Mix-Stacked and Auto Quantize) can get lost.
I think, it is rather some driver problem than a problem with Cubase (Intel Core Ultra 7 265K onboard graphics, a 2560x1440 and a 1600x900 display, Windows 11).
Setup Common Records Mode windows (the first two from the left) are a bit broken on MacOS 15.6.1 with Cubase Pro 15–but they sometimes draw correctly if I click another Record Mode option first. The last three pop-up windows work OK for me.
Is it always cut off for you? Can you post a screenshot?
Same with a maximized window. When I resize the window, shifting the bottom up, the dialog box stays like that until it “hangs” under the window; only then it moves up.
The same issue also happens in the MIDI Remote Mapping assistant when you want to change the type of mapping on controllers that are already mapped. Much like the reported issue, it happens every second click.