Are you talking about the newsletter module? there we show only the lists that you've already synced in the component. So if you need to have a specific list in the module, go to the component -> lists and sync the list you need.
It looks like the current extension only supports up to 10 lists. I would be interested in hearing from the maintainers if there are plans to address this or if I should fork the component and maintain my own version to address this.