Good morning all !! here I still need help I managed to create a virtual button to turn on and off my lights Group: Switch: OR (ON, OFF) light “Active Lights [% d]” // e.g. ON and “2” but I would like him to do only the off how? then I would like to know how to create parts in sitemap or I have…

First read the manual and check the examples: https://www.openhab.org/docs/configuration/sitemaps.html