SUMMARY
Archlinux, left screen is primary (dell), right screen is my TV (Samsung).
When i launch Kodi, it starts under the mouse.
In kodi, i have 2 choices in the settings : xwayland0 (left screen) and xwayland1 (right screen).
Whatever i choose it stays on the left screen.

Kodi log : https://pastebin.com/QLcC0YrR

STEPS TO REPRODUCE
1. launch kodi in dual monitor, it will always go under the mouse (left screen in my case, my primary screen)
2. try to put kodi on the right screen in kodi settings (fullscreen mode)

OBSERVED RESULT
It stays on the left screen

EXPECTED RESULT
To go on the right screen

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: archlinux latest
(available in About System)
KDE Plasma Version: 5.25.2
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION
I manage to put the kodi window on the right screen by doing :
in kodi, windowed mode -> on the desktop, right click on the top menu of the kodi window-> change screen-> hdmi samsung
But everytime i try to go back in fullscreenmode in kodi, the kodi window go back on the left screen.