You are able customize the order of the Watchlists & Screeners section on the Dashboard.
To change the order simply tap on the ellipse to the right of the "Watchlists & Screeners".
To change the order, you can press-and-hold a list until it scales up in size, and drag it to your new desired location.
Additionally, you can also remove lists from the dashboard by tapping on the red "x" icon.
Your changes are saved automatically.