Where is the UI element responding… | Apple Developer Forums

Where is the UI element responding to .changePlaybackRateCommand

According to the document, I can add or change some elements on Command Center on iOS as well as the NowPlayingView on WatchOS.

But I can not find the UI element responding to the "changing rate" action on WatchOS. My code is following:

Code Block swiftlet commandCenter = MPRemoteCommandCenter.shared()
commandCenter.changePlaybackRateCommand.supportedPlaybackRates = [1.0, 2.0]
commandCenter.changePlaybackRateCommand.addTarget{ event in
      changeRate()
      return .success
}

Code Block swift
let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.changePlaybackRateCommand.supportedPlaybackRates = [1.0, 2.0]
commandCenter.changePlaybackRateCommand.addTarget{ event in
changeRate()
return .success
}

I suppose there will be a rate-changing button replacing the right-bottom corner menu button on WatchOS's NowPlayingView as Podcast app.

Thanks for your patience and help.