I have an iMAC 5K, late 2015 desktop. When I export photo images from LR CC to my desktop I always use the same settings when exporting jpeg. The only thing that changes is the name of the file and sometimes the watermark I choose to use. My question is...Why would some of my exported images open full screen when I double click on them (from my desktop) and others only open about a third of full screen size (without making any changes in the export settings)? I'm trying to send some images to a potential client and I want them consistent when they are opened. Right now they are opening small or full screen.