How do I make my hero banner fill the whole screen height?

Open the hero section and go to the Layout tab. Then set Section Height:

• Auto (from width): the section's normal height.
• Short, Medium and Tall: about 40%, 60% and 80% of the screen height.
• Full screen: the full height of the visitor's screen.
• Custom…: type a Custom Height and choose a Unit (px, vh, % or rem).

Full screen can feel too much on a phone. Click the Mobile device tab and pick Tall there if you like. Click Save when done.

Tip: to have your header float over a full-screen hero, tick Transparent header on the page's edit screen.