1. First open the su screen, find the blank library bar on the screen, and click or touch the screen to enter.

2. Find the title bar of the blank library bar on the screen, hold down the left mouse button or touch the screen and hold it down, and drag the blank library bar to the target position of the su screen.

3. Drag the blank library bar to the target position, then release the left mouse button and place the blank library bar on the Su screen.