How to set the secondary screen wallpaper for lgv50s?

Lgv50s sets the wallpaper of the auxiliary screen as follows:

1. Open Settings, Wallpaper, and select a new wallpaper, Life.

2. In the real-time list, click any wallpaper.

3. After entering the wallpaper preview page, click the livePhoto option to preview the wallpaper.

4. Click Settings and select Settings to lock the screen or set the secondary screen at the same time.