On 2 monitor is no Custom Resolution?

So as I said I can't create my own resolution on my 2 monitor that I connected to my laptop.

Have it set so that the laptop screen is off.

It's just so that if your screen z.b. 1600x900, you can't choose 1920x1080.

Right click on the desktop - display settings - 2nd screen - resolution -

Here you can see which triggers you can use but if it does not go higher, the screen will not trigger higher

He has 1920x1080 I would like 1080x1080