Undo/redo is a common feature of various interactive applications and systems. With PDF Reader Pro, you can undo and redo annotation actions at any time. It's easy to operate and can greatly save you time.
1. Open a file and enter the reading page;
2. Annotate with tools at the bottom annotation toolbar;
3. Tap to bring up both undo and redo;
4. Click undo/redo button to undo/redo.
Note: The Undo and Redo features let you remove or repeat single or multiple annotation actions, but all actions must be undone or redone in the order you did or undid them - you can't skip actions.