I knew you could change the size - but I didn’t know you could change the mesh.
I guess making a wireframe mesh with an emissive material would be a workaround, but it seems to me that what is effectively an icon in a user interface should be visible even when you don’t have a sun light in your scene by default.
It would also be useful to have a (perhaps togglable) field of view representation, as virtually every other 3d software has. Bonus points for showing depth of field with this! Lights in UE already handle this elegantly with a wireframe cone but cameras don’t (unless I’m missing something very obvious, which is possible).