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Thanks for reaching out.
While you can control your lights individually and by the rooms assigned, we don't have a way to control them by the floor assigned. I suggest create a room for each floor so that you can still control them by group. You can check this link for more information.
Hope this helps.
Thanks for updating us. Glad to know that the steps provided by Alex worked on your end.
Since this has been resolved, we'll consider this as complete and will lock the thread now. Feel free to start a new one if you need assistance with your Google Nest speakers and the community would gladly lend a hand.