This article will explain in more detail what features are contained in the Viewport and how to use them
The Viewer panel consist of one or more viewports (one per slide) organized into a grid.
The currently selected / active slide is highlighted with the blue dashed border.
There are several details and controls you can show / hide by clicking the » / « buttons.
If you're looking at a single slide, you will also have a toolbar underneath with a toolbar underneath it (only in single-slide mode)
The toolbar consists of (left to the right):
PIMSLS allows to load multiple slides into the grid in addition to opening multiple viewer panels with grid inside. Each slide position could be changed using [i] [#1 on picture #2] button on top of viewport - it's required to drag and drop that [i] handle to the desired position - it could be either another cell, tray or new viewer panel. In addition Column/row of grid also could change it's position - there is a handle [#2, #3, #4, #5 on picture #2] near each row or column that could be drag and dropped to the required position.