1, the simplest and rudest way is to separate cats when they eat. However, if everyone feeds the cat with a feeder, then this method may not have much effect. If this is the case, you can add another feeder in another separate room, which can reduce the situation that cats compete for feeders and protect their food.
2. If cats feed in the same room, and cats are not used to sharing plates before, it is suggested that each cat be assigned an independent plate. Then supervise them when they eat, make sure the cat eats on its own plate, and stop and correct the cat's bad behavior immediately.
3. Playing interactive games with cats and rewarding them with delicious food will also help reduce the food protection behavior of cats. You can interact and play with the cat with a teasing stick or other toys to ensure that the cat will not show unfriendly behavior to other cats during the game. If cats don't fight during the game, you can give each cat some food rewards and praise them after the game. Cats will establish positive connections in the process of this interactive game and gradually let go of their vigilance against each other.