1. First, click on the desktop to select Properties, click Settings, and select Advanced.

2. Next, enter the advanced property setting interface, select "Screen Resolution and Refresh Rate" in the left menu, click the "Advanced Timing" button in the right window, and a settings dialog box will pop up.

3. Finally, select "Fixed Aspect and Horizontal Scaling Ratio" from the drop-down menu in the "Flat Panel Display Scaling" column and set the stretching ratio.