Can't disable unified inbox after latest update

Hi there

I just updated to version 1.9.0-87660767. It seems to have removed the ability to disable unified inbox. I used to be able to select my accounts from a dropdown menu at the top of the left panel, but now my inboxes are combined under All Accounts and the best thing I can find it having to hit ctrl+1/2/3 to switch through my inboxes. What happened to the original method and how can I get it back?

Thanks for any help