nvm, I figured it out. So the option to select other denominators seem to appear only if I start with “Create New Metric” instead of duplicating an existing metric. Not sure if this is the intended behaviour.

interesting

i have a follow up question if you don’t mind, but it seems I can only use Binomial as denominators, even though the documentation also says I can use Count metrics. Is there a specific restriction on what the denominator can be?