The split-screen function is used to manage the view mode of the scene window. Currently, it supports two-screen, three-screen and four-screen display. The specific operation steps are as follows:

1. First, in Unreal Engine - Project Settings - Project - Maps and Mode , set the local multiplayer - two-player split screen layout to vertical.The split-screen layout of the three players remains inclined towards the top.
   
2. Run the setup scene.
3. Click the Scene - Split Screen button to switch to the Split Screen Settings panel.
4. Click to enable split-screen, and select the viewport mode. You can also check the visible and hidden layers in each viewport through the viewport selection list. By default, all are checked.
5. Currently, the two-viewport only supports vertical layout, and the three-viewport only supports left-1 and right-2 layout.