This app allows you to turn the display on or off using the proximity sensor.
Just cover the proximity sensor to turn the display on or off.
NOTE: The proximity sensor usually sits up near the top speaker.

Features and Benefits

• Persistent service: Background service.
Autostart on boot and after update
• No root
• Easy to use

Options

• Screen Off
• Screen Lock
• Screen On

NOTE
This service does not interfere with the proximity sensor during a call.

IMPORTANT: Device admin app.
Device administration must be disabled before uninstalling.
Just click on the button at the top right and select the "Remove active admin" option.
You can also search in your device's security settings (Device admin apps):
Settings - Security - Device admin apps
and deactivate this app.
NOTE: The path may change depending on the device.

TROUBLESHOOTING
https://julietapp.blogspot.com/p/troubleshooting-general.html

Plus version
https://play.google.com/store/apps/details?id=com.argonremote.proximitysensorplus

Proximity Sensor Cover Wave Screen On Off Auto Screen On Off Auto Screen Lock