CMS collections not linking

Design help CMS
1

Im unable to connect or disconnect any collection list on my site. Never had this issue before.

In the dropdown when I click on a collection, nothing happens.

Thanks!

https://preview.webflow.com/preview/koyamedical?utm_medium=preview_link&utm_source=designer&utm_content=koyamedical&preview=0ab87e5f9e8caaaaabf3cf3166a16a12&pageId=63fe8e7c3f8d74cdb8943a2e&workflow=preview

Here is my public share link: LINK
(how to access public share link)