You can change the background of your PowerPoint slides using the "Format Background" feature located in the "Design" tab.
To add live translation in PowerPoint, go to the Slide Show tab, click Subtitle Settings, and select your spoken and subtitle languages. Choose a microphone, and adjust subtitle placement. Start the ...
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How to Crop Pictures in Microsoft Word, Excel, and PowerPoint
To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.
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