When editing an expression (sorting, filter, parameter of get data from, text formatted as… get from API etc), the editing panel is replaced by the new one…
Arranged the panel beside the other, side to side, as long as our sreen is wide enought, would give a much better UX.
Sometimes I go about 4 levels down and have to make all way again. Secting a pevious panel would make easy to go a step back.