The Picture Manager is essentially a viewing tool for pictures. To turn them into all thumbnails, which are usually the default, you can just hit Control and T. To change it into a "Filmstrip" view, with all of the possible pictures at the bottom of the window in a long row, you can press Control and B. To get just one picture isolated and alone you can just go with Control and G. To either remove or bring back the "Task Pane" that allows you to perform a list of functions in the software you can just press Control and F1. The standard refresh is F5 by itself.