How do I remove a website from the dashboard?
What do you mean by “remove”?
You can completely delete a website and all it’s data in the website manager.
Or do you just want to hide it for one user? Then you can just remove the viewing rights for this user.
Totally remove it from view, from the database. I have multiple clients and this one just left us, so I want to completely remove all traces of it from Matomo.