When Xfce 4.18 was updated to Xfce 4.20 earlier this year, Lock screen settings were moved from xfce4-power-manager to xfce4-screensaver
Xfce 4.20 tour – Xfce
xfce-Power-managerScreen Locking
There is no dedicated “security” tab anymore. Lock screen management was massively simplified and “Light Locker” was dropped. “lock-on-sleep” is now synchronized with xfce4-session and xfce4-screensaver.
Screen locking settings are now only handled by xfce4-screensaver to avoid conflicts
But Manjaro updates did not automatically install xfce4-screensaver and remove light-locker, and users reported similar issues with screen blanking after 5 minutes, that were usually resolved by installing xfce4-screensaver manually
pamac install xfce4-screensaver
