Thanks for bringing this to meta.  I am wondering if perhaps this comes from a version difference issue.  The original question is asking about Premiere CS6.  Both ProfessorFartSparkle and I verified independently that CS6 does the full screen preview which is now what the user was asking for.  It may be that CC has changed that behavior.  I do think that it would be a legit answer to the question to explain that it is not possible in CS6, but is possible in CC though.  If you'd like, we can also discuss this more in chat (or here if you prefer) as it seems like a lot of the issues may just be based around misunderstandings.