When you group columns, there is a toggle button on top to fold/unfold the group.
This button by default appears on the right, which means that when you unfold the group, it jumps. So that you can't just fold and unfold in 2 clicks : you first have to find where the button has jumped
Does anyone know how to put the grouping toggle button on the left, and not on the right as is the default after grouping columns ?