To verify the order of the routes, you can click the ‘Auto-align’ button. It will arrange the routes according to the actual order from top to bottom.
You can also use the ‘Explain Flow’ button. It triggers an animation that shows how the data flows in your scenario.
If you want to set up your flow so that a specific route runs before the other ones, you need to unlink them all and then reconnect in the order you want them processed.
In order to do that, you need to right-click the module and hit ‘Unlink’.