UE4: Resize geometry via draging a face?

As a complete noob, I have looked at the first few tutorials, but I seem to have missed something important.

How do you resize geometry by draging a face.

IE: I’m making a room. I as I’m placing a wall (block brush), I get 3 of the 4 faces lined up. How do I align the 4th face of the box without moving the other 3?

(How do you select and move a face or vertex on a piece of geometry without moving the entire object?)

Go into the brush edit mode :slight_smile: Now you should be abel to move the vertices

Thank you.

I guess that part isn’t covered until much later in the tutorials.