please implement better logic on the relation between the span and interval select. If the span is 1 Day, why does the interval select have options longer than a day? and if span is 1 Day and in interval I pick 1 Week, the chart reloads with span set to what? It doesn't indicate. Looks like either 5 Year or All. Point is if I change span, interval should provide relevant options.
Maybe make both the span and interval selects interactive where each option opens an adjacent new select with the relevant options?
How could you launch such a significant UI change without more UAT??
Multi layer menus are commonplace - easy, known UI.
PS I hate that now I have to move my mouse twice to pick the span - once just to activate the dropdown and a second time to pick the interval. FEWER CLICKS IS BETTER. And no significant space savings by changing the span buttons into a select.