I have the latest version of Photoshop CC (19.1.1) on the MacBook Pro (15 inch Retina with external 27" set as main monitor). When I open photos, they open on the main (external) monitor as they should, but recently, they are opening smaller than normal (as if the space is cramped). It's as if they are opening on the smaller MacBook monitor.
As you can see by the attached photo, it opens at 50% when clearly there's enough room on the screen to open at 100%.
Is there any way to rectify this? I already deleted all the preferences and restarted the Mac and the problem persists.