Presenter Mode - Settings Changed. Help!

My options for sharing a PPT in presenter mode have changed and I can't figure out how to hide presenter notes from my audience.  Before it was simple.  Share a specific document versus sharing your screen.  The problem is I no longer have an option for sharing an individual document that's open.  My options are share entire screen or share application windows.  I can no longer select an individual document.  When I pick the PPT application window and try to go into presenter mode, my presenter notes are visible to my audience.  What am I doing wrong?  Please help.  Thanks!