The App is something that needs a lot of work.
Considering you can't make dining reservations on it yet, (something that is possible even for the small restaurant in our village can do)
It will be a while before you can make ordering food possible on it.
This is something I was hoping with Disney taking control of Disneyland Paris would change. The processes to booking and ordering in Disneyland Paris seem to be so antiquated compared to other parks. The button on the app to make dining reservations, that very cleverly opens a link to their phone number quite frankly in 2020 is laughable.