To open a new tab in a specific container, replace the letter T with the number of the container. Example: If you want to open a new tab in the 6th container, use Ctrl + Alt + 6. This can also be used for reloading tabs in its corresponding container, which is useful if you landed on a page in the Google container, but want to open the site outside of that container.
To reload the current tab in a different container, use Ctrl + Shift + [number]. Say you're on a website that uses Google's OAuth login system (e.g. Udemy), you may to open that in the Google container to avoid signing in to another container. If your Google Container is the 5th one in the list, the command for that will be Ctrl + Shift + 5.
Regards,
James