After creating shapes that I plan to reuse, I create a gallery to store them for later. Begin by opening the gallery by clicking on Tools > Gallery. In the gallery pane the “New Theme...” button lets you create a new theme that will appear in the scrolling list. Then you can add shapes to the theme by making sure it is selected on the left, then drag the shape from the canvas into the gallery space on the right.

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The dragging is a little tricky. It is accomplished by clicking and holding the left mouse button on the shape until the cursor changes appearance. Then it will allow you to drag the shape into the gallery pane.

Note: Since galleries are listed in alphabetical order, I found it helpful to start all of my map galleries with "Map" so they would be listed together.

For my purposes I created the following galleries:

Maps Buildings - contains shapes resembling different roofs.
Maps Cities - contains the silhouette city icons for world/area maps.
Maps Compass - contains compass roses.
Maps Furniture - contains top down views of furniture.
Maps Legends - contains bordered legends in which I display the map name, etc.
Maps Plants - contains top down views of plants similar to those found in landscaping software.
Maps Terrain - contains hexagonal and square terrain shapes for all types of maps (area, indoor, dungeons, caves, etc).