How to change the background color

1. Format>Background
   

2. Then click it

   

3. Select color you want to apply

   

4. If you want to more color
   

5. So use mouse click the ‘More Colors’
   

6. Then select the color you want click ‘OK’

   

7. Click ‘Apply’ or ‘Apply All’
   

8. ‘Apply’ is apply the color to one slide
   

9. ‘Apply All’ is apply color to all the slide