Manage your maps
Edited
Everything you do to manage your maps except saving and renaming (see Rename and save a map) are made from the My maps interface. This menu is accessible from the menu displayed at the very top of the map.
Here is the My maps interface.
It is composed of the following:
The New map button
The list of your maps, including your unnamed maps that were and automatically saved by Map Builder
A search bar to find a map more easily if you have a long list
The saved and draft maps are shown in the same way. For each map you'll see:
The name of the map or "Untitled map" label that can be clicked to open that map
The map's URL and when it was last modified
A Duplicate button, to duplicate the map
An icon to delete the map