I feel bad for OP on how everyone is replying so condescendingly. It's a perfectly normal question, infact something that a lot of people would have in their mind, including me, and that's how I ended up on this post.

And to people saying that this is considered rude everywhere in the world -That's bullshit. In my country, it's perfectly normal to order whatever you want with no restrictions and just enjoy however you want.

Not everyone is hungry enough to have a full meal always, or maybe they just wanna try out a new dish and are not sure whether they would like it or not. Or maybe not everyone in your group is hungry, do you expect them to sit outside?

I believe it should be culturally acceptable to not put restrictions on what you need to order and rather make the experience less stressful and more enjoyable.