How to disable Navigation Icon when using Android Jetpack Navigation

Question

When you register a toolbar with navigation architecture it will create an arrow allowing you to pop up on the fragment you are on.

On a few base level fragments I don't want to have the Hamburger menu icon nor the arrow but a custom view object.

How would I disable the back button from view?

I have tried manually disabling but am having a hard time finding out how to manage it with Navigation arch.

val supportActionBar = activity?.actionBar
    if (supportActionBar != null) {
        supportActionBar.setDisplayShowHomeEnabled(false)
        supportActionBar.setDisplayHomeAsUpEnabled(false)
        supportActionBar.setHomeButtonEnabled(false)
        supportActionBar.setHomeAsUpIndicator(null)
}

Answer 1

Well after a good hour I hope that my pain and oversight really helps someone out. After Navigation Architecture forces you to load up a drawable into the navigation icon the only solution I came up with was to nullify it.

toolbar.navigationIcon = null