Here’s a list of possible solutions to fix you phone’s screen not turning off during calls:

1. Check if you’ve enabled any settings that may be causing the issue
2. Check if your phone’s power settings are configured to turn off the screen when you’re in a call
3. Check for the latest updates for your phone and download them to see if it solves the issue
4. Reboot your device to see if that helps
5. Try uninstalling any apps that may be causing the issue
6. Reboot your phone in safe mode and see if the issue persists
7. Consider restoring your phone to factory settings if the issue still persists