If an app has hung up, it can be forced to quit via the app settings, but data may be lost.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Apps & notifications
Step 4:  Tap on  App info
Step 5:  Tap on desired  App
Step 6:  Tap on  Force stop
Step 7:  Confirm with  OK
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on App info
  5. Tap on desired App
  6. Tap on Force stop
  7. Confirm with OK

LG Instructions
Loading...

Transmitting...