How can I make a custom tab (and the content for that tab) only visible to users who are not a member of the group?
For example, I created a custom tab with the "custom fields" function called "Custom Tab" (see image below). I want the tab to only show to people who are not a member of the group. And the tab should be invisible to people who are a member of the group.
How to achieve this?

For example, I created a custom tab with the "custom fields" function called "Custom Tab" (see image below). I want the tab to only show to people who are not a member of the group. And the tab should be invisible to people who are a member of the group.
How to achieve this?
