Resetting to "Standard" membership site instead of "Advanced"

Hi - I installed Membership and then ambitiously selected "Advanced" site in order to be clever and show off. Silly me!

I can't change it back to "Standard" member site. I have deactivated, deleted and then reinstalled but it is still in "Advanced" mode.

I'm sure "Advanced" isn't that tricky, maybe just adding shortcodes in the rule sets, but I'm a newbie and have panicked. Maybe another day.

How can I go back to "Standard" member site settings?