Outlook App for iOS: Calendar

Hello,

I just downloaded the Microsoft app on my iPhone. I can view mail, and my main Calendar, but I can not view my additional calendars. This is my view on my desktop, I want to be able to see what I have scheduled for 'Deliverable Projects', etc. on my phone. Currently it only shows my main 'Calendar'. When I go to add an event on my phone, I get the option to set the event with any of the ones below. 

On my phone I can go to Outlook app > Settings > Calendar > Default: it shows where i can choose ONE of the calendars as my default view, but I want to see all of them.