By default, I'm using (from more shapes), My Shapes, Favorites.

If I select Process as the shape (basically, a simple rectangle) and drag it across to my diagram, the shape styles suddenly change such that all the shapes are either bordered in blue or filled in blue.

In the same way, if I select the connector tool, all the lines are blue.

How do I change my favorites to be the "right" size and colour by default for my purposes ?