You can just set the start and end padding on the inner EditText to 0dp.
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="0dp"
android:paddingEnd="0dp" />
</com.google.android.material.textfield.TextInputLayout>
Here’s a screenshot with Show Layout Bounds turned on so you can see that the hints go all the way to the edge of the view.