No means of closing an open book

[StevanWhite]

This is Android 10, on a Cubot KingKong mini2 App version 0.4.3

When a book is opened (or fails to open!) the top menu bar disappears. No amount of swiping, clicking, double clicking brings it back.

If there were just a "Close" item on the bottom menu button, it would resolve the issue. Otherwise --- some other readers bring the top bar back by swipes or double clicks, etc.

A work-around is to clear the app's storage, by means of the system Settings.

This problem renders the reader essentially useless on this system.