Answered
UI Scaling Option Unavailable
I am currently running Photoshop CC 2017 on an iMac 27-inch OS X El Capitan and am unable to use the UI Scaling option. All my files are too small and not its actual size.

All help is appreciate!
I am currently running Photoshop CC 2017 on an iMac 27-inch OS X El Capitan and am unable to use the UI Scaling option. All my files are too small and not its actual size.

All help is appreciate!
You can adjust the Interface, but images on a Retina Mac will display smaller.
100% zoom is too small on screen (designers don't get high resolution displays)
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