F-I-N-A-L-L-Y!! I understand now...(I think...)

You are wanting the Restore Down/Maximize icon to work in your version (2016) like it worked in 2007 (and, maybe 2010) where the Restore Down reduces the size of that particular file to roughly half-screen then when clicked on again returns the file to full-screen. Well, FWIW, that icon does not work like that in 2013 either (at least, not in my version). However, that particular option should not hinder your work as there are other options (as you indicated above) in the VIEW tab.