Nothing is displayed/visible in parallels windows

[RemiF1]

Hello,

When I start Parallels Desktop from the launchpad or from Finder, most of app windows are blank. See attachments.
But when I use the following command (found here) to start the app, everything works correctly.

QT_QUICK_BACKEND=software open /Applications/Parallels\ Desktop.app

Anyone have an idea on how to fix this permanently?

 

[RemiF1]

Had to create a VM once started with the command.

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