The operation steps of displaying the upper and lower windows on the computer at the same time are as follows:

1. Step 1: Open the first file you want to display.

Step 2: Open the second file you want to display.

3. Step 3 Click the right mouse button in the blank space of the taskbar in the lower frame.

4. Step 4: Right-click the taskbar and select Stack Display Window.

This completes the operation of displaying the upper and lower windows on the computer at the same time.

Extended data:

Win 10 Windows settings, used for fast synchronous display on the computer.

1. By default, it is stacked. Right-click the taskbar and select taskbar settings.

2. Select "Never" from the "Merge Taskbar" button on the right taskbar.

After setting up, you can use atl+tab to switch between different windows. In addition, if you want to switch to the desktop quickly, you can press win +D to switch between the window and the desktop.