You can select to show only territories on map from ‘Manage map and data’ dialog. Follow these instructions to open that dialog:
Open Map & Data window if it is not already open. Click Map & Data tab centered on the left side of map.
In Map & Data window move mouse pointer over map layer and click gear icon that will appear. Choose map layer that matches the base used to design sales territories. For example if you designed sales territories by ZIP codes then click gear icon for ZIP codes layer.
In ‘Manage map and data’ dialog select General vertical tab.
Select Territories and check ‘Filter data on map’ box.