Under FFXIV configurations, you can choose "Windowed Mode." This will allow you to move freely between one screen and the other. Unfortunately, you cannot run the game in full screen in windowed mode, nor can you resize the window, and their resolution options don't always match what your monitor is... I found that setting the background of my second monitor to black and then having a small black box around the gamescreen works out for me.
____________________________FFXI: Catwho on Bismarck. Once again a top bard on the server: Dardaubla 90 on 1/6/2014
FFXIV: Katarh Mest on Lamia - Member of The Swarm and the League of Extraordinary Crafters
I can't understand anyone who skips the cutscenes of a Final Fantasy game. That's like going to Texas and not getting barbecue.