HTC Desire 20 pro User Manual page 65

65 Battery
4. Under Manage battery usage, tap Background restriction.
5. Tap Restrict.
Repeat the above steps to turn on background restriction in other apps.
Checking which apps are battery restricted
1. On the Home screen, tap Settings.
2. Tap Battery Adaptive Battery.
3. Tap Restricted apps to see the list of battery restricted apps.
§ You'll see this option only when there are apps running in the background that you've restricted
from using the battery.
§ On the Restricted apps screen, you can enable or disable restriction for each app.