I have ubuntu 20.04 (with Gnome) installed on a laptop. The laptop is connected to an external monitor. I'd like to be able to have things be the same physical size (in inches, not pixels) on both displays. That way a window can span both displays without having one half of it shrunk.
The displays each have a different DPI (edit: In this case they are both set to 1920x1080 but the external monitor is bigger. There is not a resolution they can be set to to make the have the same DPI). I've tried applying a scale factor (and even a fractional scale factor) through the GUI. I went through every display option in settings and tweaks. I don't see a way to set them separately for each display or set them to match.
I actually got out a ruler, computed the DPI for each display, and figured out a scale factor for one display to make things the same size. Reading through other questions, it looks like you can use xrandr to then set a different scale factor per display.
That seems like a pretty round about way to accomplish it. Especially because I ended up needing a ruler to measure the displays and compute DPI. :)
Is there a simple way to get the same size in inches, not in pixels?