Disney World restaurants just aren't set up for to go orders*. You'll have to get a table/seat at the bar to even place an order, and they're not going to package it up to go. They MAY bring it out on plates and bring you a box to package it up yourself...or they may not.
"To go" is just not something really done at WDW.
*Disclaimer, because there is invariably going to be SOMEONE who will claim they got a to-go order there.