When you have Memberships that are only for certain members, such as a Black Belt Membership or a membership option that has a special payment plan, you can hide these from the member app so only certain members can be added to the membership.
You can not hide an entire Membership Category, only the Options within the categories.
To hide this, go to Services and Products > Memberships > Edit on the Membership Category:
Then go to the Membership Options and click on the box that says "Do not show this membership program on member app"
After clicking this box, the members will not see this on their app. When they click on Black Belt Legacy, there will be no option to register.
To have members register for a hidden Membership option, they will need to the Membership Program URL to that specific option.