Why doesn't the back arrow in the fragment work?

Question

Android

I bind the ToolBar and create an arrow:
(activity as MainActivity).setSupportActionBar(binding!!.tbDetail)
(activity as MainActivity).supportActionBar?.setDisplayHomeAsUpEnabled(true)

Handle the click:

binding!!.tbDetail.setOnMenuItemClickListener {
when(it.itemId) {
R.id.home -> { Toast.makeText(context, "Home button pressed", Toast.LENGTH_LONG).show() }
R.id.delete -> { Toast.makeText(context, "Submit button pressed", Toast.LENGTH_LONG).show() }
}
true
}

item delete works, but the back arrow doesn't. Maybe I'm not referring to the id arrow correctly (I don't know where to look), but of the id offered by the studio, this is the only one that fits logically by name

Answer 1

android.R.id.home