I know that there is a screen saver feature on the PS4 version, maybe they just havent added it to the Xbox one version yet.
You could try turning your display off on your TV as a temporary fix.
well there was a bouncing plex logo on the ps3 which was just clearly an advertisment for the plex
just need sopmething to avoid the burn in and there was mention that the photographs could be used as a screensaver somwhere else on another forum but that does not work as a screensaver