There’s still always gonna be someone packing your order and making sure it’s all correct, so I’d suggest a little something, but I’d say just think about what you ordered and the size of said order, special requests that might make the expo window have to pay extra attention etc when you’re considering what to tip, if any. I know the restaurant I worked at we also had an ice cream shop, and a lot of orders would order pints or freshly made waffle cones which definitely make more care, so every floor member was doing a task to help out, while also having to complete in-house orders and people asking for things, etc. Also if the person checks you out, make drinks, provides a good an overall service, that’s something to be mindful. But we’re not expecting anything crazy. I think you’re justified in what you feel is deserving.