Global > Footer includes Shared > FooterColumns but is not selectable

[Thermal-Shock]

There appears to be a problem with your demo content type model.

You have a Shared > FooterColumns that contains a title and then a repeatable component of links (Shared > Link).

You then have a Global > Footer that appears to include this as a repeatable component, however this is not selectable as an existing component. The "Select a component" even says "Select ..." instead of the component name (e.g. "shared - footercolumn" for example.

It doesn't appear possible to create a component that includes an existing component that contains a component.

Yet somehow you've managed to force your demo to allow this. This should not be allowed if the user themselves cannot replicate it.