The short answer: No.
The long answer: You don’t need to hang curtains or blinds over every kitchen window. Technically, you don’t even need window treatments in your kitchen at all.
Unlike in the bedroom or bathroom, kitchen curtains are almost entirely optional. Leaving one or more kitchen windows completely bare is fine if that’s what best suits your family’s lifestyle.
With that said, kitchen curtains and blinds are still super useful for adding privacy or filtering light. For example, you’ll probably want to install some type of covering if your kitchen windows face a busy street or directly into the sun. Anything else is purely for decoration.