CVar guildShowOffline

Whether to show offline members in the guild UI.

Default Setting

 * 1

Possible Settings

 * 0 :Off
 * 1 :On

Changing this setting
In-game, type the following /console guildShowOffline setting

Alternatively, you can exit wow, open the Config-cache.wtf file, and add the following line: SET guildShowOffline setting