When you do a ‘Save As’ and change the format to PDF, it will create you what BO terms as a Data Dictionary, providing you a list of all the objects, their connections, formulas and all the other wonderful things that it has.
Failing that, you can also download a this tool to give you all the same information but in an Excel file.
https://bobj-board.org/t/59650
plessiusa 
(BOB member since 2004-03-22)