Export (Default) will initiate an export using the default export settings. The default export settings can be adjusted to your liking through the Preference window.
To start an export you must first select a cubical map in the Navigation Tree. Once a cubical map is selected there are three ways to start an export with default settings.
From the Main Menu select File → Export (Default)
Right-click on a cubical map in the Navigation Tree and choose Export (Default) from the context menu.
Press Ctrl+E on your keyboard.
When doing so, the selected cubical map will automatically be exported and saved to the user's Desktop inside a folder named Cubical Maps. The default export location can be changed through the Preference window as well. The default name given to the file will match the name it uses in the Navigation Tree. For example, if your were to export a cubical map named "My Cubical Map", the resulting file would be "My Cubical Map.dat".