Harold, unfortunately currently this plugin doesn't have any setting that control order of memberships. Thanks for pointing this out. We will consider this feature for next updates.
The only way to put memberships in needed order is to create them in this order.
So you will need to add all needed roles first.
Then add memberships in alphabetical order.
So if you have "Gold", "Silver" and "Advanced" user roles, you will need to add "Advanced" first and "Silved" last.