I have the s10 plus which I'm very happy with, when I turn on the phone it changes automatically everytime to another background.
I have been searching the internet but I can't find how to change also the homescreen background automatically just like the lock screen does now as I really like it?
You have selected the wallpaper pack and that's what it does . I quite like it. Anyway you need to pick a single wallpaper.
Settings.... wallpaper and themes...... the select a wallpaper at the top of the page but not where is says multipack or pick your own from the gallery icon .