How to set collage as wallpaper
Set as Wallpaper
Click the Export toolbar button and choose Set as Wallpaper.
Choose Scale of the wallpaper as Fill Screen, Stretch, Center, or Fit to Screen.
Click Fill Color to set the filling color you like.
Tip
1. The default preference of Scale to Screen is Main Screen.
2. When you set Scale as Fill Screen or Stretch, the option of Fill Color will be disabled.