Collabora and LibreOffice

I have a collabora server (on Nextcloud) and a LibreOffice installed on Fedora. I understand LibreOffice and Collabora work together. Somehow. But my LibreOffice has not options for Collabora. How does this work exactly?

It works like this: the server runs the customized (branded) version of the suite, in a dedicated process. It doesn’t communicate in any way with your local LibreOffice.