You can open developer tools with Ctrl + Shift + I in Chrome and in the console check for possible errors. It might be some extension that breaks the DCM or some misconfiguration.
The problem leads to this topic
I don't really care what type of display I have for Linux machines, I rarely use it, so switching from SPICE to VirtIO-GPU solved the problem.
It would be very useful to be able to add a note when restoring a backup, for example, when you need to restore several backups and not get confused between them.