# MacOS

## **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&#x20;
* Choose `Display` tab, choose the resolution of the minored external monitor
* Reduce the built-in brightness to 0
* Done

## &#x20;
