I use two screens: my laptop screen (eDPI-1, 1920x1080) and my external monitor (HDMI-2, 2560x1440).
All my applications render just fine on both, at the resolution I would expect, with the sole exception of Zoom (the videoconferencing app) which we use for work. Zoom appears super zoomed in (no pun intended) and doesn't fit in my splits, with all the controls massive and blurry. I'm using X and have had this problem both with PopShell (GNOME) and i3 (which is what I'm mostly using).
I'm not sure if Zoom is a QT app, or GTK, or whatever else, so I don't know if this is a framework issue or an individual app issue, but I was wondering if anyone has experienced something like this and knows how to fix it, perhaps by changing the scaling/DPI for a particular app.
You can see from the screenshots that the controls are way bigger on the 1080p screen than the 1440p screen, proportionally to the resolution.