For Wayland/Plasma5 : start System Settings -> Display and Monitor then simply (with the mouse) drag the screens (monitors) in your proffered position/order, finally clicking the "Apply" button.
The order of monitors will be preserved in future, BUT be warned that booting on a X11/Plasma5 session will mess the order, as well will do booting in Wayland/Plasma5 after usage of X11/Plasma5. Looks like somehow their configuration differ.
Last edited by LuckyCyborg; 01-18-2022 at 01:32 PM.
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