If you have a team of, say, 5 people, can you reserve a nook/area to be together? Or is it like movie theater, where it isn't polite for 1 early person to hold

If you have a team of, say, 5 people, can you reserve a nook/area to be together? Or is it like movie theater, where it isn't polite for 1 early person to hold 5 seats?