Toggle submenu shows in responsive before visitor logs in

Hello:

We have created a private forum at https://coloradond.org/coand-forum. Members are required to login before entering the forum. I noticed, however, in mobile view before being logged in, the "Toggle Submenu" toggle appears. It shows the "Forums and Categories" links but, of course, do not show any of the categories because they have certain permissions.

This might be a bit confusing to the visitor. How can I ensure this does not show before the visitor logs in?

Thank you.