Turn off built-in monitor display when connected with external monitor
There are noway to actually turn off built-in monitor. But we can
- Make it minor with a external monitor
- Reduce the built-in brightness to 0 so we can ignore it.
Steps:
Open displays menu in settings
Choose Agreement tab
Hold option key, and drag drop built-in monitor icon to a external displays. After drop you will see they are minors
Choose Display tab, choose the resolution of the minored external monitor
