These can be used to create swim-lanes or any other kind of background layout you like. You can also label the Map or use text to give blocks headings. 

Drag Background objects on to the map.

Adjust and align them and their size and colour.

These objects include the backing circle, backing square and backing text. Add editable borders to squares.

These objects can also be locked in the design tab so that they stay put as you develop your map.