Thumbnail preview of secondary display on primary display? Is there a way to display a miniature version of the secondary display's contents on the primary display? This is for doing a live demo during a presentation, while keeping a dual-display setup to also show notes on the primary display. I have a vague feeling that this should be possible _somehow_ , but I don't have enough experience with xrandr. A coarse internet search hasn't revealed anything useful. I'm aware of solutions like LibreOffice's presenter mode, or `pdf-presenter-console`. This question is about displaying interactive contents on the secondary console. A solution doesn't need to involve xrandr, a utility that captures a portion of the screen and clones it in another window would also work. I'm on Ubuntu 17.04.

actually you can use vlc for that purpose (if I understand your needs correctly).

First you click on `Media -> Open Capture Device`
Then set `Capture mode` to `Desktop`. Then you check show more options and at the end you can add a few options as sen there. But I guess you can figure it out yourself by trying. It depends on your screen resolution and which screen you want to record and display on which.

Comes from there : How to record the desktop in VLC media player - second screen | Super User