How do you change a horizonal screen to a verital screen?

To change a horizontal screen (landscape mode) to a vertical screen (portrait mode), you can typically rotate your device physically. If you're using a computer, you can also adjust the screen orientation through display settings. On Windows, right-click on the desktop, select "Display settings," and choose the desired orientation. On macOS, go to "System Preferences," select "Displays," and adjust the rotation option if supported. For mobile devices, enable rotation lock to maintain the desired orientation.