Hello, @정숙 윤! Welcome to the Zoom community, and apologies for the delayed response.
Zoom annotations appear on top of your shared screen rather than being saved to individual PowerPoint slides, so they can remain visible as you move from one slide to the next.
To clear the annotations:
- Open the Annotate toolbar from the share controls.
- Select Clear.
- Choose Clear Viewers’ Drawings or Clear All Drawings, depending on what you’d like to remove.
Please note that there isn’t an auto-clear feature, so if you use your own annotations, you’ll need to manually select Clear whenever you want them removed.