No, the church does not have regulations or habits in this regard.
If the place is bigger, build it bigger. If the place is smaller, build it smaller. The bigger church will look solemn, and the smaller church will be warm.
In fact, small churches are relatively common, and they are all residents of this area. Most of the churches are filled with relatives. In some places, it is simply a family gathering, and everyone is very happy like this.
The cathedral is beautifully decorated, decent and grand, but I feel that it is still not as comfortable as the chapel