Using custom map templates is a great way to save every detail on the map (even driving speeds, fuel consumption etc) and be able to pick the best starting point for your trip planning.
If you simply launch S&T from the Start menu in Windows you’ll always open the template file called “New North American Map.stt” but there is a special way to see a dialog with all your map templates. Starting from within Streets & Trips click on the File menu then choose New.
If you haven’t saved any custom map templates your dialog but will only have 2 templates by default. You can learn more on how to save/change a map template from this post.