[LAU] [OT] Multi-monitor setup for extending and mirroring displays

Dear list,

please excuse the following for being largely offtopic to linux audio. I
can't seem to find any useful information via startpage.com nor can I
think of a list I am subscribed to to ask the following:

I sometimes have the need to show pdf slides in presentations and like
using pdfpc[1], a "presenter console with multi-monitor support for PDF
files" using an extended X display. I do as well have the need to show
the (single) desktop I am working on. The only way I can achieve this is
to switch back and forth between the two setups using xrandr.

I am using a display manager (fluxbox) with multiple virtual desktops.
I am wondering if there is a smarter less interrupting way. 

What if I had one extended display, whose left side is on my laptop's
screen and right side on the video projector, and had something like a
vnc-client on the right side, mirroring what is going on on the left
side of the screen. I could then show what I am working on on the left
screen but also have the pdf presenter console span the left and right
side of this extended display together.

I hope my description and question do make (some) sense.

If anyone has an idea I'd be happy to know!
thanks, and exuse the OT post,
Peter

[1] https://pdfpc.github.io/
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