Hi Immi, as for xrandr it is just the part screen mirroring feature. However, you have to create a set-up for each and every projector (if they are not really identical) even having nominal the same resolution, they slightly differ (by a few pixels). I simply ended up with a couple of (one for each room) bash scripts, from which I call one right before my lecture. As from xournals side, you only have to take care that you use the same magnification. Usually you want to make the slight as big as possible on your screen without the need of scrolling. This part of the screen you will mirror by xrandr. One more note, if the resolution of the projector and the resolution of your screen differ a lot, you might miss fine details on the projector screen (e. g. a very thin line or arrow) this is due to anti-alasing features of the projector, its a feature not a bug (and has definitely nothing to do with xrandr or xournal). Beside of xrandr I use xinput and wacom settings to rotate the screen and make sure the pen rotates as well, I switch off touch, thus I have no trouble with my handwrist touching the screen. This for sure depends on your hardware settings. I use a lenovo thinkpad Yoga 14 which rotates the screen in tablet mode.
I can post my settings on github if you are interested. greetings Torsten
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