Best solution is to install another launcher, set that one as default and remove/disable default launcher. I installed projectivity launcher and effectively disabled default launcher using one of these adb commands.

If you are using Android TV Launcher,

$ adb shell pm uninstall --user 0 com.google.android.tvlauncher

If you are using GoogleTV Launcher,

$ adb shell pm uninstall --user 0 com.google.android.app.tv.launcherx

Source : https://www.tvusage.app/use-as-launcher