Server Version#:
Player Version#: Plex for LG 4.29.9
WebOS#: 4.9.0
I noticed the issue with the early access version, then switched back to the version above. Neither client will close when “exit” is selected. From a privacy standpoint, the work around is to either switch user or sign out, but neither of those exits the app. When exit is selected from the user menu it brings up the LG home menu and leaves Plex and the user home page displayed in the background, but it does not exit. Even if you select some other app from the LG home menu, Plex and the last user remains active and waiting.
Also, if you do go the switch user route, there is a power button icon that contains an exit option, that option also fails. Select power icon>>select exit>>message “Are you ready to exit Plex?”, Exit or Cancel, select Exit>>just bounces you to the LG home options while Plex remains open.