How to erase ink in the playing state of a PDF file
1. Use WPS Office to open the PDF file.
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.