Question / Help Game Capture on iMac

[bige13]

I'm trying to do a game capture on a iMac, and when I do it looks like the image is to big that pops up on the OBS preview. this is what i'm getting

http://imgur.com/5FMVqLh How do I scale it down so i can see what I'm seeing in the game?

 

[Narcogen]

Right click > Transform > Fit to Screen