M1 Macbook or Mac mini How to use an external monitor vertically.

Whether it's an M1 MacBook or a Mac Mini 

To use the monitor vertically at 90 or 270 degrees 

In this way, the resolution is also reduced and the monitor is enlarged.

So if you try to adjust resolution

   1080 * 1920

 There is no resolution.

In this case, hold down the 'option' key and

Click 'Adjust resolution'.

Then you can see 1080 * 1920 resolution like this

If you choose, you can use it normally.

Resolved in FHD,

It was also resolved in QHD.