I am a bigger person . Do they have seats to accommodate a bigger person

They do. Most seats are booths

You can also sit on the porch.

I'm 250lbs and fit fine.

I suppose it depends on how big, but my partner is heavy and has never expressed discomfort in the booths. The Kennesaw location also has tables in the bar area, so if you could be comfortable in regular dining chairs, that seating option would also be available.