How do I export a mesh of my world visible in a given viewport

Some caveats:

  1. I am new to UE
  2. Apologies if this is not the right subcategory to ask this question. It struck me as a best fit.

I would like to export a mesh of a scene I am working on, preferably restricted to all objects and scenery in a given viewport. I have no idea where to start.

Can anyone offer me any tips as to how I might go about doing this?