Since I have several smart light connect to my smart switch (old version), so in order for me to know the states of the switch I will need to know if my smart light is on or off. However some cases it appears as unavailable, so the button will be gray out. Is there a possibility to set the states as off instead of unavailable? Thanks
Then you may not have done it correctly. The original light will be greyed out but the template light should be still available. Show the config you used.