I think the menu in your toolbar that allows you to open a new tab in a particular container (you then have to do it via a long press or right-click on the new

I think the menu in your toolbar that allows you to open a new tab in a particular container (you then have to do it via a long press or right-click on the new tab button), to re-open a current tab in a different container, and this new container-specific VPN functionality.