Same here, I can’t even control some of my virtual instruments, because some of their knobs at the far bottom / far right of their GUI are clipped or not accessible at all. Looks as if the container windows of the Plugin is too small. Or maybe Cubase 10 is reporting a wrong size to the Plugin, so it scales improperly.
This is one of the worst problems of Cubase 10 for me. It prevents me from using it regularly. All this does not happen in Cubase 9.5. So one might blame Steinberg, but as this scaling problem does not happen with every plugin I have, it could be a “misunderstanding” of the two sides DAW and Plugin. Bad situation. One cane blame the other - and we will never get a proper solution.