My 2.5 year old sits at the table on a normal chair, I did have her on a little booster for a while but she's tall and wanted to be the same as her 3.5 year old brother so I got rid of it. I always eat with them or at least sit with them with a drink if I'm not hungry. If she starts losing focus I offer to help her and do some spoon or forkfuls for her til she's ready to do it again herself. She can get distracted and get up and down a couple times but I just remind her we need to sit at the table to eat and she comes back or says she's had enough x
We all eat together & she's strapped into her booster seat at the table so she's can't get down & run around. She often asks for help she doesn't need just for attention.
We will sit with her at the table but we are also going through a similar phase if we are all eating she’s better but if we aren’t I don’t force her to stay but if she wants to come back to eat she has to sit back up at the table x
My girl is still in her high chair for main meals x