The answer is simple. Simply use your three fingers to double tap on the screen.
Having accidentally turned on an accessibility option in the settings menu is the cause of the problem. The screen can be zoomed in for one to easily read screen contents. However, we may accidentally zoom in its screen in a way that you can’t navigate and use it that the text and screen contents are actually very large.
To fix it, simply follow the recommendation from its settings menu:
“To zoom, double tap with three fingers.”
Just use that method to zoom in and out.