How to Change the PowerPoint Theme for the Existing Presentation

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It is very easy to change the PowerPoint theme for the existing presentation. Here’s a short tutorial on how to do it:

1. Inside the slide canvas of your PowerPoint presentation, head over to the top menu bar and click 'Design'.
2. Following that, go to the Theme Gallery and click the drop-down arrow below it to view the collection.
3. Choose the new theme you wish to set.
4. Finally, the default PowerPoint theme of your existing presentation will be changed accordingly.