Hi caroline.dunne,
It’s not possible to change the order of your lists in the left navigation bar in the mobile apps, but they should reflect the change you made in the web app.

If that’s not working for some reason, you may want to quit and restart the app, or restart your iPhone.

Hope this helps, but let us know if we can help with anything else!

Thanks andrewski, I did wonder if that was the case! I've changed the order via the web app and it has updated on my phone.

Many thanks