In windows 7 and 8 this can be accessed by right clicking on the desktop and selecting screen resolution.
Windows vertical screen.
A window should open similar to the one shown below.
In windows xp select properties and then click the settings tab.
Windows 7 8 and 10.
While holding the windows key win key if you press the left or right arrow key the window that is currently focused will be moved to the left or right portion of the screen respectively.
Locate the orientation option under resolution click the dropdown menu under it and then choose your preferred screen orientation landscape portrait landscape flipped or portrait flipped.
Right click on an empty space on your desktop.
Press the windows key type display settings and then press enter.
To change your screen s orientation from vertical to horizontal if you are using an amd gpu you need to.
On windows 10 you ll be taken to the settings system display window.
On windows 7 you ll end up at control panel appearance and personalization display display settings.
In windows vista select personalization and then click the display settings option.
Under orientation click the down arrow at the edge of the box.
Select your orientation click apply and then ok non windows 10 users.