Kindly refer to the following link(s):
Is it Sunnah to eat from the same plate? | Sheikh Assim Al Hakeem
Is it permissible to eat while wearing our shoes, socks, sitting on the floor...?
Is it Sunnah to eat on the floor?
It is the Sunnah, however, there’s nothing wrong with eating at the dining table.
Kindly refer to the following link(s): https://islamqa.info/en/9894