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Mukesh Kumar 107Mukesh Kumar 107 

How to collapse the Trailhead Module Header in iPhone as you read through its content?

When I read the content of the Trailhead Module on iPhone 7, header of the content takes up around 20% of the top screen. When viewed horizontally, it takes around 40% of the top screen (see screenshots). I could not find a way to collapse the header.

Does anyone know how to collapse the header?
Or is it a Responsive User Interface issue?

See attached screenshots. 
Trailhead Module on iPhone 7 - vertical view

Trailhead Module on iPhone 7 - Horizontal view