@Carl-Lee, since his friend is "trying to switch to MRA" and this is in the [App] category of the forum, I think it is a safe bet to assume he's using the MRA app
@roger-needham-0, yes that's possible. every route or track that you navigate automatically shows the original route/track beneath the route line as a whit line that you will see if you deviate from the route/track. So you do not need to do anything about that, just enable that "show original route" option in the settings.
It will be different if you want to show another track beneath the route you are navigating. You can enable multiple routes or tracks to be visible on the map from within the route menu. Pick a route (or track) from the routes menu, tap the 3 dots menu en tap "Show on map". Now if you go back to the map view or start another route to navigate, the first route is shown on the map. You can do this with multiple routes, and even complete folders.
Actually, since the introduction of this feature, the app is WAY more flexible in this than a Zumo