When the Samsung device is charged, a screensaver can be displayed which is started as soon as the display goes into the actual sleep mode. Samsung's One UI offers as an option a colour change, photo frame, photo or photo table. The screensaver itself can be switched on or off in the display settings.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Screensaver
Step 4:  Choose the desired  Screensaver
  1. Open the Settings
  2. Tap on Display
  3. Tap on Screensaver
  4. Choose the desired Screensaver