I would like to expand on of the Video windows with Teamviewer QJ 14 on Mac El Capitan

HooHa909

I have used Teamviewer several times with a company that I do work for. I run Mac El Capitan and do a quickjoin with Teamviewer 14. I cannot figure out how to expand the one video window that I really need to see. This seems to be an issue with the Mac as the Windows solutions are  apparently able to expand the video. Is this a capabilty that doesn't exist or is it just buried in a menu someplace?