Dining Room Seating

What do other facilities do as far as assigned seats in the dining room? I have always thought it was against resident’s rights to force them to sit in a certain place (aside from assisted feeders), and vice versa not allow them to sit somewhere because it is someone else’s “assigned” seat. We’ve had a couple of altercations due to one resident being upset that someone else is in “his” seat.  How would other facilities handle this?