Hi. I have a 3440x1440 monitor. Everyday I use it with 125% scale, it suits me best. But when I run my flight simulator, I would prefer it to have 100% scale in order to use full 3440x1440 pixels. Can I somehow create a shortcut (preferably assign a mouse button, keyboard is also ok) to switch between the two?
Thanks in advance.
Probably a small script would do, e.g.:
xrandr --output eDP-1 --scale 1.5x1.5
Unfortunately, Wayland 
I forgot to include it
Edit: I think it is possible in kscreen-doctor with a command, I will try it
Yes, now I switch using my mouse extra buttons.
Can you post solution for others?
Surely. I created two scripts, named monitor_regular.sh and monitor_flightsim.sh, here are their contents:
monitor_regular.sh:
#!/bin/bash
kscreen-doctor output.1.scale.1.25 #Monitor I scale is number 1, one can check it with kscreen-doctor -o. With more monitors you also have to adjust the position, but I have one.
monitor_flightsim.sh:
#!/bin/bash
kscreen-doctor output.1.scale.1.00
Then I assigned keyboard shortcuts to those scripts, and then mouse buttons to keyboard shortcuts.
If someone notices something wrong here, please let me know.
Scaling does not reduce your resolution.
Really? Thanks for the information.
Still, I keep my shortcuts just if I need more screen real estate.