As Nick says: 'Toolbox', but just to make it specific for anyone new:
To show the whole route:
Toolkit -> Fit screen
And the reverse, i.e. zoom in to the max on a waypoint:
select waypoint to get the pop-up -> Magnifying glass
The second one is vital for getting your waypoints positioned just right (i.e. on the correct side of a dual carriageway, and so on)