The master can be modified in ppt. After modification, all ppt will be modified in batch. The specific operation method is as follows:

1. Open the local ppt file;

2. After opening the file, select the design menu from the top menu and click Enter;

3. In the design menu, select the secondary menu-edit the main menu;

4. Select the preview image of the main background preview window to be replaced;

5. Right-click the picture in the ppt master window, click the right mouse button, select Delete or Change the picture, and replace it with the desired master picture.

7. If there are multiple master formats in a master, you can modify them as many times as needed, and then exit the slide master.