suggest sizing of areas

I was using the program this afternoon - and could not find a way (other than "full size") to be able to work with a number of pics at a time - my suggestion is to "increase the area of the pic selected" and decrease the area of the files shown in the folder. I could not find a switch/button to increase "visual area" - I did see the magnification slide on the side of the work area - but nothing to increase the "work" area itself - I hope this helps - looks like a great program - Thank you for the ability to help you - help us.