Starting from version 1.4.0, the filter rules can be cleared from options menu.
After the filter rules are cleared, the app shows a result dialog box.
When the app clears the filter rules, it may lock the screen orientation.
The app does not follow the latest Android API to handle screen rotation. The portrait and landscape orientations work well. Nevertheless, the 'reverse' landscape is shown upside down.
In version 1.7.0, the screen orientation is not locked by default. Screen rotation cancels the clearing.
When clearing filter rules, it is advised to keep the screen in portrait orientation.
When clearing filter rules, exiting the app will cause a crash. This issue is solved in version 1.6.0.