All three of those apps (Firefox, Chrome/Chromium, and the part of Nautilus which draws the desktop background and provides that context menu in the screenshot) are using XWayland.
My understanding is that only native Wayland apps support display scaling correctly. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1756073 Title: Display scaling doesn't work properly on second display Status in gnome-shell package in Ubuntu: New Bug description: Ubuntu version 17.10 I have a laptop with 2560x1440 display and a 1920x1080 BenQ display. The scale is set to 200% on the built-in display, but some windows are also getting scaled on the second display. Attached screenshot demonstrates it. One terminal window I opened right on the second display, and one window I dragged from the first display. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1756073/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
