Guidelines and the Layout Grid
Guidelines are used to align objects on the floor plan or elevation view, and also to mark up the layout before drawing or placing objects.
To add a guideline, tap on the plus button in the toolbar and choose the Auxiliary tool set. Then tap on the Add Horizontal Guide or Add Vertical Guide button.
To select a guideline, tap on it.
To move a guideline, drag it.
To remove a guideline, long-press on it and choose Delete in the popup menu.
Like other objects, guidelines are listed in the Project Tree where they can be locked or made invisible.
There are also smart guides in the program. Smart guides are temporary guidelines that appear when you draw walls, floors, or ceilings, and when you move objects.