Note: If you are using xorg, and global scaling is set but not applied to Qt applications after reboot, please check if xft.dpi is set in ~/.Xresources. Restart for the settings to take effect.System Settings > Display and Monitor > Display Configuration > Global Scale.To adjust font, widget, and icon scaling together: This solution affects both Qt and GTK applications. You can use Plasma's settings to fine tune font, icon, and widget scaling. $ gsettings set .preferences titlebar-uses-system-font false $ gsettings set .preferences titlebar-font 'Cantarell Bold 22' # Change as needed Note that the title-bar-uses-system-fonts option should also be turned off. This can be done through the dconf editor ( org > gnome > desktop > wm > preferences :: titlebar-font). In addition to editing the relevant shell theme's CSS file, users on Xorg may also wish to increase the title bar font at the top of open applications. The top bar, application menus, calendar, and other shell elements should now be correctly scaled. Once these changes have been saved, activate them by switching to another theme (for example, using gnome-tweaks) and then reverting back again. To enable HiDPI, navigate to Settings > Devices > Displays > Scale and choose an appropriate value. 6.23 Unsupported applications, via weston.6.22 Unsupported applications, via a network layer.1.1.2.1 GTK+ vs Gnome Shell elements on Xorg.

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