Unable to Unpair dimmer switch from Yeelight ceiling light.

I paired my wireless dimmer switch with 2 ceiling lights. But I want it to work with only one. I cannot find a way to unpair it or reset it. Resetting the ceiling lights doesn’t work. Removing the battery of the switch doesn’t work. I can’t find anything in the Yeelight APP.
Can you help me on that?

Click on the device in yeelightapp and select Remote control and switch. Here you can see the wireless dimmer switch you connected. Swipe left to delete it.