I have enabled the multi-account extension - but I see the same history between containers.

I have added the "Firefox Multi-Account Containers." I see the container icon, indicating it is "contained." I have clicked manage containers and created separate containers like news for instance. I switch between personal, news, shopping and used each supposedly separate container. But, I see the same history in each, which is not what I expected. Do I need a different Firefox account for each container?