It was supposed to be incredibly easy. On the 2020 Google Chromecast remote, you could set the YouTube button to any YouTube service by simply pressing and holding the YouTube button. A picker would automatically appear.
I'm holding the button. And holding it. And holding it.
Nothing.
Any ideas?
Button Mapper or keymapper apps will do it. I admire these apps and I've been using Button Mapper on my mobile. But these apps require accessibility service and in some android TVs it's not possible for now.