In the Pan & Zoom window, if you do not see a blue box, drag to create a blue box. On the View tab, in the Show group, click Task Panes, and then click Pan & Zoom. Zoom and pan by using the Pan & Zoom window The controls include a slider that sets the zoom level, a button to fit the page to the size of the current window, and a button to open the Pan & Zoom window. Hold the pointer over each control to see what the control does.
The zoom controls are in the Visio status bar, below the diagramming page. Click Advanced, and under Editing options, select the Zoom on roll with IntelliMouse check box. Click the File tab, and then click Options. Note: You can change the default behavior of an IntelliMouse wheel from scrolling to zooming.
