You can quickly and easily change the screen auto-off time. You can also select 'Keep Screen On' to prevent the screen from turning off.
Please try to use the app widget. You can easily change the screen auto-off time by simply touching it.

[App Permission]
● Full network access
Use a small amount of mobile network (3G, LTE, etc.)
● View network connections
Check the status of your mobile network (3G, LTE, etc.)
● Modify system settings
Used to set the screen auto-off timeout

Please be sure to allow the 'Modify system settings' permission. This is a required to change the screen auto-off time.