I work with macOS and have a MBP connected to an external screen using Display Port
The external screen has about 4 times as many pixels (2HD) compared to the MBP.
When I move a VM windows from one window to the other it used to adjust to the different
pixel density without any delay. Now when the VM window is moved from one screen to the
other the different pixel density play a role. The surrounding window is the same size but
the pixel density in it change with this fact 4, i.e. heigh and length change a factor 2 and
text in the VM Windows becomes bigger or smaller depending on how the windows was moved.
This can be adjusted in the setting/deisplay scale factor where I need to go from 100 to 200 percent
or back. But I wish this was done automatically as it was before.
I am pretty sure this error came when upgrading from VBox 5.x to 6.x.
This upgrade I made many months ago.
I have the same problem with all guests OS: Windows 10, Ubuntu 20.04, Xubuntu 18.04.
Would appreciate som help here. Can be a simple setting somewhere.