How to set ppt background unification?

Set the background image of the slide, and then click Apply All. Let me demonstrate the detailed operation steps below? (ゝω? )

(Computer model: HP Shadow Wizard 8Pro, software and version number: WPS11.1.0.13703)

1, open a PPT presentation document.

2. Click the slide page, right-click, and then select Format Background.

3. Fill Select a picture or texture fill, and then click the local picture.

4. Find the background image and click it, then click Open.

5. Set the background of such a slide, and then click Apply All.

6. In this way, all the background images are unified.

The above is the ppt background picture set as a unified course. Why don't you give it to your friends who have studied? *(ˊ? ˋ*)*?