Noob question here. I have drawn two simple shapes, and want to define the distance between them. I drew a triangle first, them a rectangle. I want the triangle to stay put, and the rectangle to move into position. I anchored the triangle with a Fixed Relation. I then used Smart Dimension to set the distance between the two shapes. But when I use this, the rectangle stays put and the triangle moves.

Due to being a new user, I have no ideas on what to do next. Is there a way to choose which entity will move when applying Smart Dimension? Or should I be doing something else?

Screenshot is attached.