Hey @Dourza !
I have a similar issue on my laptop using Linux (OpenSUSE/KDE). It is an hybrid graphic laptop, and whenever I use the offload prime render solution, Unreal Engine UI is messed up! And I cannot easily move the Editor from one screen to another without having a weird glitch. I have none of these issue on my Windows partition.
The -nohighdpi solution solve a bunch of the issue. However, there is still some weird issue, where the mouse pointer in Blueprint editor is behaving weirdly when moving around the editor.
Have you found a solution to your problem yet? It seems that the support/dev team of UE does not really care about Linux, and it is almost impossible to find help and support for this.