Hi, Is there a way to hide the navigation bar above the photograph full screen preview to see a clean image without distractions?
Yes, though it differs based on what OS you're running. You didn't specify so I'll list macOS and Windows versions.
macOS: You can hide/show the toolbar from the View menu (View->Hide Toolbar). To get it back choose "Show Toolbar" from the View menu. Or you can Enter Full Screen from the View menu which will put the Preview window into its own space and the Toolbar will auto hide/show depending on where you put your mouse cursor.
Windows: Press F11 to enter/exit Full Screen Mode which will hide the Toolbar and the title bar of the Preview window.
HTH,
-Kirk
