You can split the map view either horizontally or vertically so you can see different sections of the map at the same time.
When the map view is split, the two panes can be viewed independently. This means in each pane you can select different objects, use a different zoom factor or level of detail, even use different filters, or different views. The two views are kept in sync: Any changes you make to the map are immediately reflected in the other pane.
This is especially convenient when working with large maps. For example, you can display the entire map in one window to get an overview, and work on it, zoomed in, in the other window.
Do one of the following:
On the View tab, in the Window group, click Split, and then click Horizontal or Vertical.
Right-click the map's workbook tab and click Split Map Horizontally or Split Map Vertically.
You can drag the splitter bar between the windows to change their size.
On the View tab, in the Window group, click Split, and then click Remove Split.
Right-click the map's workbook tab and click Remove Split.