How to erase ink in the playing state of a PDF file
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2. Click the Play Slide at the bottom to play slide in full screen.
3. Click the Pointer Options drop-down button in the upper right corner, and click Eraser.
4. Place the eraser on the ink, with just one-click, the ink can be erased.
5. Or we can click Erase All, the ink is removed instantly.
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