"To rotate the screen" means to turn or change the orientation of the display on a computer or mobile device. It can be done to make the screen appear in a different direction, such as flipping it from portrait to landscape mode. Full definition
You can also manually rotate the screen from portrait to landscape and vice versa. (hubpages.com)
When rotating the screen, it takes several seconds for the display to rotate. (zdnet.com)
But I found a noticeable lag in doing everyday things, such as rotating its screen orientation from landscape to portrait, switching between apps and even loading Web pages. (phys.org)