In related news, the "List of Actions" in the Rule 4.0 docs is helpful to the poster's specific issue of knowing which commands are accessible from which sub-menus. See: https://docs.hubitat.com/index.php?title=Rule-4.0#List_of_Actions. You'll eventually get used to it, and it's usually easy to guess where what you want is based on the category. Dimming, color, and CT actions are, unsurprisingly, all under "Set dimmers and bulbs"--but if you only want on/off, check "Control Switches, Push Buttons" instead. (BTW, I've submitted a change to this wiki page recently so the list matches up with the actions as listed in the current firmware, but it's been pending approval for a while).
The forum thread for Rule 4.0 docs--pretty much the same content at the time of release (and only minor changes since)--is also good (and has inline screenshots). It took me a while to get the hang of earlier versions of RM and a bit of adjustment when 4.0 was released, but this was a big help.
