If you have two displays, Phototheca can utilize a second screen as a view area for a selected photo. If a second display is connected, there is a button on the bottom panel at the right side that expands Phototheca on the second screen.
When Phototheca is expanded to a second screen and you select the thumbnail of a photo, that photo is immediately displayed on the second screen.
Click the button again to turn dual display mode off.
