| Issue | Likely Fix | |-------|-------------| | Ctrl+Y deletes a line instead of redoing | Change keymap: Settings → Keymap → Redo – assign Ctrl+Y if desired | | Redo is grayed out | Perform an Undo first | | Redo doesn’t restore previous state | Use Local History → Show History to browse older versions |

| Operating System | Default Shortcut | Alternative | | :--- | :--- | :--- | | | Ctrl + Y | Ctrl + Shift + Z (Custom) | | macOS (New) | Cmd + Shift + Z | Cmd + Y (Classic) |

By following these guidelines and best practices, you can make the most of the redo feature in IntelliJ, improving your productivity and coding efficiency.