Well I feel dumb. You were asking about the initiative manager and not what I'm on about in my other comment.
The functionality that used to be in the URL you pasted above is now available from Hub Overview. From your app launcher, click "Hub". This will land you on the Overview. Then click "Manage" on "Initiatives" to get to the list of your initiatives or your templates. If you're looking to change sharing on them or delete them, visit each initiative to complete those actions. We want to introduce bulk controls on this screen at some point.
I hope this helps! Sorry for not getting it right the first time!
PS you can also return to this list at any time from edit mode using the dark blue "Hub" menu and selecting "Initiatives".
