The navigation bar is closed: it is displayed at the top/vertically at the top of the screen so as to not use up the limited horizontal space of a mobile screen
The navigation bar is open: it expands from top to bottom to optimally use the screen dimensions
Then:
see a view that always makes optimal use of the screen dimensions for optimal user experience
Improving Landing Page Mobile Layout
Scenario:
User is using site in mobile view
Given:
When:
Then: