Bug Textmesh Pro Text Quality based on Desktop Window Size

I noticed the Quality of a TMP_Text is based on the window size on the desktop. If I set the window to 640x480 the Text gets hardly readable and has grey squares inside of it (in VR only).

Even when the HMD has a resolution of 2k x 2k the Text is horrible in VR, when the desktop window is small. Basicly the more resolution the Desktop window has, the better it looks in VR aswell.

Is there a way to make the Text Quality based on the HMD Resolution instead of the Desktop window ?

Edit: I tried it with a 4k Font Atlas, but that didnt improve the Quality when the Desktop window is small.

 

To reproduce the Issue, set Game view to 640x480 (Or Binary), and look at the text with your HMD.