The toolbar currently contains 7 buttons. From top to bottom
(Re) Connect to Database - this will show the database login form if you want to reconnect to another Database Server
Database References - this will analyze the database itself for references among objects
File References - this will call up the form to analyze client application files for any references to SQL objects
Drop Objects - this will generate SQL Drop statements for all unreferenced objects.
Options - will show the options form
Reference Graph - this will show the graph of Database objects by type by referenced / total.
Help - will open the help file