Zorin OS with xrdp in Fullscreen gets cropped

I wanted to install Zorin OS on Hyper-V on Windows 10 Pro and after I followed this guide the enhanced Mode of it works so I managed to enable Fullscreen Support (with also installing this fix for post Ubuntu 18.04.2 OS) but somehow the Window is cropped like if the Screen is cut on the upper side (not seeing the task bar and icons are way bigger). Anyone has an Idea or a fix for this?