Can I choose a ready-made header design instead of building one?

Yes. Go to Settings → Appearance → Layout Settings, on the Header tab:

1. Make sure Header Visual Builder shows Builder OFF. When it is off, the store uses a preset header.
2. Under Prebuilt Header Templates, filter by All Types, With Top Bar, Standard or Minimal.
3. Click Activate on the design you like. It is marked Active and goes live straight away.

The previews are sample images. Under Header Options you can also set the Mobile Header Pattern, Container Width and Sticky Header.