Inventory bar disappears from the screen

Samsung Galaxy J7 (2016)

The problem is shown in the attached small screenshot video.

Inventory bar on screen disappears during game. It's very unconvenient.

 

Previous actions: hand, buttons and inventory bar visibility was turned off and then turned on in options.

I did it many times before (hand and buttons visibility) and there were no problems.

Can it be fixed somehow?

Thanks.