hlubach the point is that it not rotate the screen as in a tablet .
so only landscape mode works
I'm still pretty confused. Plasma allows the screen to be rotated, but it doesn't force it to be rotated. It allows the screen orientation to be adjusted to your requirements, but once it's been set, changing it would require returning to the system settings to do that. It's not something that would happen without your specific intervention.
Plasma is a huge improvement over the GNOME DE, in many ways, so I'm trying to make sure that you're able to make your decision knowing all the facts. If only GNOME will work for you, so be it.