I have a menu inside the top actionbar that allows for changing a password, editing their profile, and logging out. What I need is, once they click the "edit bio" option, I want to add an arrow or a "<" to the actionbar on the left side to allow the user a "go back" option if they want to exit editing the profile as well as hiding the right side menu option while they are editing. Here's my code for inflating the menu on the right:

```
override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
        inflater!!.inflate(R.menu.profiletoolbar, menu)
        super.onCreateOptionsMenu(menu, inflater)
    }

    //get the actionbar selction when pressed
    override fun onOptionsItemSelected(item: MenuItem): Boolean = when (item.itemId) {
        R.id.userLogout -> {
            FirebaseAuth.getInstance().signOut()
            val i = Intent(context, Login::class.java)
            startActivity(i)
            true
        }
        R.id.editBio -> {
            editProfileBio()
            true
        }
        else -> super.onOptionsItemSelected(item)
    }

```

I really want to understand what the process is behind how this works. Can someone help me? I'd also be okay with just replacing the menu on the right with an arrow or a "<" as well, although I don't like that idea as much.