The split screen works only when you have at least two or more tabs opened in the browser.

To use this feature, click on the split screen icon in the toolbar, and you’ll see the screen is now divided into two: the right split screen and the left split screen. 

 On the right, you see all the tabs that are currently open, and from here, you can select the tab to view in split screen mode.

The screenshot below shows the Edge browser displaying two of our articles in split-screen mode. Notice how easy it is for Microsoft Edge users to compare two different sites in the split-screen view.