I picked - install task-3ddesktop (Metapackage for 3D desktop)
unfortunately it went very badly, lost both screens. the xorg.log file said the NVIDIA driver couldn't be loaded. but got everything back now. Tbh I am not quite sure how I got the screens back.
I have found that configuring the NVIDIA display settings in root is better than going through Configure Your Desktop_Hardware_Display and Monitor_Size & Orientation
Now in the PCC it says "your system does not support 3D desktop effects"