1. When we first build the document, the display page on the right has a white background.

2. We find the menu bar above, find the view menu inside, and click Open, as shown.

3, and then continue to click on the slide master style, as shown in the figure, and click to open it.

4. In this way, enter the master property control area and find the background style bar as shown in the figure, with a drop-down menu. Click to open it.

You can see many styles and backgrounds and various color settings here.

6. In addition, in the text subject bar on the left, you can also find many color main styles after clicking Open.

7. These two backgrounds can be directly created or matched with each other, and many beautiful background textures can be created and cannot be moved.