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Hi,
There is two different ways to use your virtual machine on all monitors, but for both scenarios your need to open View menu of the virtual machine > enable 'Use All Displays in Full Screen' feature. After that simply enter Full Screen view mode and the virtual machine will extend to all displays.
When Mac displays have separate spaces
If macOS feature 'Displays have separate spaces' is enabled, you will switch between Mac and virtual machine spaces on every display independently.
Check this https://kb.parallels.com/115171 for more info.
Please let me know if it's not that case.