Project page shows series status but changing it requires going to separate page

A project page, such as <https://launchpad.net/bzr>, lists the series for the project and says which of them are active or obsolete. But to change the status of a series, you need to go to the page for the series, then choose "Change details", then change the status on a third page.

It should be possible to change the status of a series, in the project page, by clicking on the series you want to change.