Display settings are reverted to the default values when one reboots/relogins.
To workaround the issue, one can create a new display profile with wanted settings, save and apply it in Advanced tab in Xfce's display settings.
See Also: (none) => https://bugzilla.xfce.org/show_bug.cgi?id=15437
There's an upstream commit that should fix the issue: https://git.xfce.org/xfce/xfce4-settings/commit?id=1f94a8b0890d2c3228e5c70b24c5cc9979ebb9d5
Should be fixed with xfce4-settings-4.13.6-5.mga7 and mageia-xfce-config-4.120.7.7-1.mga7.
Resolution: (none) => FIXEDStatus: NEW => RESOLVED
Thanks, Jani :-)
CC: (none) => marja11