If you want to rotate your screen by 90 degrees, here's how to do that:
Press the CTRL, Shift and Refresh buttons at the same time — the Refresh button looks like a curving arrow and is located just above the 3 and 4 on your keyboard.
In the pop-up, select "Continue."
Open the settings by clicking into the clock in the bottom-right corner of the screen and then selecting the gear icon.
Select "Device" in the left sidebar.
Choose "Displays."
Click open the "Orientation" dropdown.
Select the new orientation degree you want from the drop-down menu.