How to hide 1 menu item in navigation menu

enter image description here

Idk how to hide item/group (android:id="@+id/nav_add") and change color icon item "add"

Schedule.class

public class Schedule extends AppCompatActivity {
    private DrawerLayout drawerLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_schedule);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        toolbar.setTitleTextColor(getResources().getColor(R.color.white));
        drawerLayout = findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,
                R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        toggle.getDrawerArrowDrawable().setColor(getResources().getColor(R.color.white));
        drawerLayout.addDrawerListener(toggle);
        toggle.syncState();
    }
    @Override
    public void onBackPressed() {
        if(drawerLayout.isDrawerOpen(GravityCompat.START)){
            drawerLayout.closeDrawer(GravityCompat.START);
        } else
        super.onBackPressed();
    }
}
How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum