Smart lighting app cannot group lights together and Control them and set state to on/off/dim. At least I couldn’t find a way. Smart app is for one bulb at a time. Ex. I have 4 lights which need to control using one switch (group of bulbs).
I came across a custom app that may need to be installed called dim with me. Not sure if that need to be used or if there is a way to use smart light app.