Of course, unless you eat a lot, you don't need to have "one main dish and six dishes" on the menu. It's impolite to order too much and not finish it. However, it should be noted that a slightly standard restaurant does not welcome guests who only order side dishes. If you just have a light meal, you can just have an appetizer and a main course, plus a dessert. You can skip soup or appetizers, which is also an ideal combination.