Good point.
One way to make it so users can toggle it on and off is to convert it to a theme, as opposed to a theme component. I’ve added that to in the instructions at the top of the page.
You can also do it by setting up a group that users can freely join and leave. This takes advantage of the theme setting that can be set to only show it to specified users and groups. I’ve also added that option to the instructions at the top.