Please support multi-value and single-value hierarchical parameters.
Well-organized parameter options reduce users' cognitive load.
Merging main and sub categories saves precious dashboard space.
That said, it would be nice if this was introduced simultaneously with its precursors.
I have been aware of this being missing for some time. Hongjun Liu's question in Do we have any way to create multi-level hierarchy? encouraged me to post it and thus continue my campaign of showing the value of good forum questions.