Recently, there are flying swallows under the roof. Is there any impact and countermeasures for Feng Shui School?

Good thing, I am in Fujian, and swallows are auspicious here. If I build them on the eaves, at the gate, or on the wooden beams of the living room of the old house, it will be very bad. OK In the living room, many people will make horizontal screens to block bird droppings, and the windows in the living room will be left open for swallows to come back