The backside can be changed and the setting will be saved automatically. So you only need to access this function if you desire a change.
The arrow above shows the the new backgroud. You can go through all of them (191) in steps of 5 or 5, either further or back.
Above the previous picture so you can compare with the new one and do not mistakenly take the old one again. Below the blue arrows for back and forward search through the 191 possible pictures. If you like the choice click “OK”.
© Hans Jürgen Hubert - Köln (Cologne, Germany)