Basically, you just need to add extra lanes depending on how thin you want the lanes to be. On my laptop screen, I can only see 13 lanes at a time by default (with the MultiDock collapsed and the Control Bar not collapsed).
Here's how the lanes look when I have a total of 24 lanes and hold down the Z key and drag one (or more) of the lanes horizontally.
Here's how they look when I have 50 lanes in total and do the zoom.