Hi @Sophia Lee
Currently you can customize the background in presenter mode:
1.After your meeting starts, at the upper-right corner of Teams, select Share content to see meeting presenter modes and other options.
2.Under Presenter mode, choose the mode that you want. Also, be sure that your camera is turned on.
3.Before starting the presentation, select Customize and choose a background image.
You can also refer to Engage your audience with presenter modes in Microsoft Teams
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