How does Apple split the screen back to the news?

Drag the split-screen app to the Dock at the bottom of the screen, and then open the first app.

2.

Slide the screen up slightly, not too much, and bring up the Dock.

3.

Bring up the second APP to be opened from the Dock, and then drag it to the right to form a left and right split screen.

4.

Drag to the middle to form a floating screen. If you want to delete the floating screen window, you can slide to the edge.

5.

If you want to bring up the suspended screen window again, you can gently slide your finger from the edge to the inside, and the suspended screen window will appear again.