On the Oppo-Smartphone there is the function "Force stop", which should only be used if the app does not react anymore, i.e. hangs up. "Force stop" stops the app like you know it on a Windows PC with "Stop task".

One of the problems with this function is that the app can no longer save all data before exiting. It is therefore possible that certain data is not saved or is saved incorrectly. It is also possible that the app will not work at all after exiting (which is rare).

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  App management
Step 3:  Tap on  App list
Step 4:  Tap on  App  you want
Step 5:  Tap on  Force stop
Step 6:  Confirm with  Force stop
  1. Open the Settings
  2. Tap on App management
  3. Tap on App list
  4. Tap on App you want
  5. Tap on Force stop
  6. Confirm with Force stop

Oppo Instructions