Signup on Membership Plugin

On the documentation for "Membership" it references the following:
"A: You may also need to turn on “Allow Incomplete Signup” from the options panel. This will
mean if your users do not complete signing up for a subscription they will still be able to log in.
Otherwise if they signup and do not complete the process of getting a subscription (even a free one)
they be shown as not active."

There is no indication or marker for an "Allow Incomplete Signups" on the Options tab. Has this been moved with the update or where can this be altered?