I have a TCL Smart TV with Android TV 8.0 and the controller has Netflix and Gooogle Assistant dedicated buttons but it has a T-Browser button that opens a list of suggested apps by TLC.
It's there any way to remap (or disable) that button?
Maybe remap it for Youtube or any other app
Can try Button Mapper app, it's fully optimized for Android tv. Search on play store or sideload it.