Categories not protected

Hello,

I try protected all the categories, follow this steps:
1. Select all my categories and then updated the ‘General Protection’.
2. Choose a membership-level, select all the categories and updated.

Testing in the frontend of my site, but the categories are showing up and when i choose a category then, listed all te content from this category.

How can i protect the categories?

Regards,
Christophe

https://wordpress.org/plugins/simple-membership/