Currently, xfce4-screensaver-preferences.desktop.in only shows "Categories=GTK;Settings;DesktopSettings;" as categories but according to the menu file [1] from xfce4-settings it should contain some more so it could be shown on the settings dialog, namely: - X-XFCE-SettingsDialog - X-XFCE-PersonalSettings [1] https://git.xfce.org/xfce/xfce4-settings/tree/xfce4-settings-manager/xfce-settings-manager.menu#n40
Sean Davis referenced this bugreport in commit ccb8abfacc734735233886562114ae6d75ff6f84 Add additional categories to correctly display in the Settings Manager (bug 15507) https://git.xfce.org/apps/xfce4-screensaver/commit?id=ccb8abfacc734735233886562114ae6d75ff6f84
Thanks for the bug report! Applied the suggested fix above.