Screen black on the laptop

Today I took my laptop from work to do home office.

I took it from the docking station in the office and here the screen is black after login.

In the office I work with two screens. PC and laptop.

How can I get that?

I know there's some keyboard shortcut… But can't reach the computer right now.

Please fast help.

Either there's ne "FN" button + a button with screen icon (often in the same color) or you WIN + P in 5 second intervals until a picture comes.