Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Projects In Progress [Addon, Scene] South of Redscar (X-Large)

Add a portion of a wall
In the editor ("mode" bar), a new handle will appear, "edit wall"
select it, then, click the portion of wall you created, it should highlight, and drag it.
furthermore, right mouse button will make options appear...