VNC screen resolution issue / Remote Desktop

Hello,

I have one question: I am trieing to VNC from Endless OS @FullHD to Ubuntu 16.04 @4k. The Ubuntu machine runs its built-in VNC as host (Gnome-VNC) and I try to connect with the 2 tools availiable in the endless store. The standard tool and Remmina. Both work, except for the resolution, I only get a little part of the upper left screen of my host and the rest of the desktop is invisible. Its not scrollable as well. Changing the resolution on the host to FullHD does not change the problem. I researched a bit on the net and it could be a DPI problem.

This is probably not directly related to endlessOS but maybe you have other ideas for remote desktops that work with endlessOS being the client side. Or maybe you know more about my problem.

I like to thank you for your help in advance.
Greetings ~ent