This tool allows you to zoom in on your drawing using a window drawn with the mouse.
To use this tool, click on the icon and then click once on the screen. The idea here is to create a temporary window or rectangle around the area you wish to zoom into. After your first click, move your mouse in a diagonal direction and you will see a temporary window or rectangle being drawn. Click again and DynaScape will zoom the drawing to best fit the geometry, that is in this rectangle, inside the workspace.