Which option should you choose to change the background of your current slide? Design Background
Format Background
Theme
Variant

Format Background

Explanation:

If you want to change the background of your current slide on PowerPoint then the correct button to use is Format Background.

You can find it by clicking on the ''Design'' tab, it will be at the far right afterwards.

You can also right-click the smaller version of the slide to the left of the screen and you will see Format Background in the options.

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