IIUC you want a container to be isolated to a single website, you have to create a container for that website, open the site in that container, and then click the multi-account container tab in the toolbar, and select to option to open this website in that container by default. From then on whenever you open the website, it gets opened in that container by default.
IIUC you want a container to be isolated to a single website, you have to create a container for that website, open the site in that container, and then click the multi-account container tab in the toolbar, and select to option to open this website in that container by default. From then on whenever you open the website, it gets opened in that container by default.