Delete Folders Outlook IOS app

I have a Gmail and have switched from Mailbox due to it closing to try and find a new one. I like Outlook over the clutter of Inbox but I have not found out how to delete folders/labels inside the app. I can do it on the outlook website and gmail website but cannot get them to go away in the IOS app even if they are gone elsewhere. I have deleted the app and reinstalled it and still no luck. How can you get rid of empty folders you no longer need.

Does anyone have a solution? I would use Apple's app if it had a snooze function. Of course I would like to stay on Mailbox but since that is going away I have no choice to find a solution before hand.