How can I export vertical video in Resolve?

Exporting vertical h.264 4k videos is only possible in the Studio version of DaVinci Resolve.

• To prepare your timeline footage, rotate the clips into a vertical position in the inspector (if needed for the correct orientation)
• In the project settings, swap the resolution dimensions, and select Center crop with no resizing for Mismatched Resolution Clips:
  
  
• Use the settings recommended in our Video Requirements, but swap the width & height values (For a 4KUHD video, that would be 2160 x 3840)