Bottom left is the preview window. All three windows can be resized easily by sliding the dividers between them. You can also select in what order the various information columns display on the right. There are many times when the thumbnail view is not sufficient. One thing you'll notice right away when viewing full size images is the speed at which ACDSee 32 works.
Images seem to load instantly.
In full screen mode, a 1292x836 photo image loaded in .6 seconds. A 4435x796 2837mb panorama photo loaded in 1.6 seconds. Right clicking on this selection give you the opportunity to save the selection thus giving a sort of crop function. This is about as far as ACDSee 32 goes as an image editor. Repeat this with any other images you wish to view at the same time.