Looks like the most recent gnome-shell/mutter (3.37.91-1ubuntu1) update has fixed this.
** Changed in: mutter (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1894177 Title: Scale factor not applied to Xwayland clients To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1894177/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs