My dd (4.5) pretty much stays at the table until she's done eating. Sometimes she clears her plate on her own, sometimes I remind her to. If she leaves the table I ask her if she's finished eating, if not, she returns to the table; if so, she clears her place and goes on with her day. It hasn't been much of an issue.
Ds is 2, and he actually stays at the table pretty well while he's eating. Occasionally he wants to wander around with food, but that's usually because dd is done and he wants to play when he sees her playing. He doesn't actually "sit" because he's decided he's done with the Kinderzeit and instead wants to be on a regular chair -- which means he often stands to comfortably reach his food.
I do see that it could become a bit of an issue with him at some point in the future because he is busy and stubborn, and I expect there to be another couple years before he is very easy to reason with. I want them to eat at the table until they are done because I don't want food mess all over the house; it is working well for us so far; we are pretty relaxed about the whole thing. (Eat what you want, leave what you don't, I'll help you clear your place and get you a washcloth for your hands and face, etc.)
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