By 2yo both my boys were out of the highchair & I found that they often ate better sitting at a toddler table or the main table with us.
Do you eat meals at the same time, as that can make a huge difference to a 2yo too.
Both my boys also went through food refusals, but at much younger ages (9mo & 14mo respectively) I found the key was to offer lots of variety & always offer 1-2 foods that I was pretty sure they would eat... my 4yo still doesn't have a big range, but does eat 1-2 foods from each food group. Also toddlers have very varied appetites & I swear there were times I felt they lived on air & hardly ate for days.