To fix a laptop screen when it’s displaying content sideways, press the Up Arrow key while holding down Control and Alt to restore the default display setting, or change the display orientation via the Screen Resolution window. If these options fail, access the control panel for the graphics card installed in your laptop, and modify the display rotation settings.
If using the keyboard shortcut doesn’t have any effect, right-click on an empty spot on the desktop, and select the Screen Resolution option from the context menu. Select the primary display, use the Identify option if your laptop is connected to an external display, open the drop-down menu next to Orientation, select the Landscape option, and click Apply. If this fails, try the Landscape Flipped option.
To access the control panel for the graphics card, right-click on the desktop, and select the Graphics Options, Nvidia Control Panel or Catalyst Control Center entry, depending on whether you’re using an Intel, Nvidia or AMD graphics card, respectively. For integrated Intel cards, open the Media Control Panel tab, select the Rotate to Normal option, and click OK. For Nvidia cards, click on Rotate Display in the Display section, select the Landscape option. Disable the Stereoscopic 3D function if it prevents changing the display orientation. For AMD cards, click on Common Display Tasks, select the Landscape option, and click Apply.