There is a documentation page for screen sharing.
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How to Share A Screen Across Qubes
> This guide involves opening up a TCP port between qubes. This is discouraged from the security standpoint and should only be used as a last resort, use sparingly.
PRESENTATION_QUBE is the Qube you want to view the screen from
CONTENT_QUBE is the Qube that has the window you want to share
## Setup The Shared Screen Server
Choose one of these sub-sections depending on whether you want to open a new screen (increased isolation), or use an existing monitor or screen.
### If You Want To Share a New Screen
In the Content Qube:
I haven’t tried screen sharing in Qubes myself yet, but I hope at least the existing documentation helps.
You could also try using a StandaloneVM, as I suspect screen sharing would work like it does in a typical OS.