A little question about multiple controls

I know there is such an extension, and I have read the official case, but I want to know the correct way to use this extension. Although I saw the original author’s video, I didn’t explain how to use it at all. For simple narration, I can’t use it normally, so can anyone help me screenshot the correct way to use it?

Sorry, I didn’t understand your message, is this about the multitouch extension? Check this out: