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How I can control HDMI to what content should visible on projector screen?

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I was presenting slides in classroom, I found that only full screen content are visible in projector. I was not able to present anything which was not set on full screen mode.
How I can control what to show in projector screen? Is there any presentation modes ? Please suggest GUI or terminal based application for it.

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sachin avatar
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added details, it's x11 session, os ubunut 22.04 lts
sachin avatar
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ok thank you for insights, I'm not that much geek, I hope you got my problem !
I sit in a Tesla and translated this thread with Ai:

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