German Munich Univ (copy) (copy)

As you'll see in the Control Room, there is no toggle that says "Only show 'Add to Calendar' to registered users." It’s a global widget for the page.

So, what's next? Since you're a Senior Solutions Architect, you've probably already realized that the only way to "hide" that button for guests is via Custom CSS or a JS snippet in the customization area of the community.