When you have multiple elements in your Revit project or family, you can equally space the objects using a dimension string and toggling the EQ symbol on……very handy but nothing new here!!!
If you select one of the elements you might notice an anchor symbol, this indicates the object that will remain stationary if the spacing adjusts. It sort of works like pinning an element but without the permanency of a pin. You can adjust the element that is anchored by simply selecting the anchor dragging the anchor to a different element.