Allow a menu item in each section to be made the default so that it opens each time the module is started

For each of the main menu section you can nominate a sub-menu option that will be automatically loaded when you first open the menu section. 
The sub-menu that is the default is marked with an asterisk.
 

To change the default to a different sub-menu just right-mouse-click on the menu item and select the 'Open by Default' option