How to Hide Call / Chat / Contact Button Admin Menus

function plt_hide_button_contact_vr_menus() {
	//Hide "Contact Button".
	remove_menu_page('bz_button_contact');
	//Hide "Contact Button → Contact Button".
	remove_submenu_page('bz_button_contact', 'bz_button_contact');
	//Hide "Contact Button → Edit buttons".
	remove_submenu_page('bz_button_contact', 'admin.php?page=bz_button_contact#/editor');
	//Hide "Contact Button → I need support".
	remove_submenu_page('bz_button_contact', 'admin.php?page=bz_button_contact#/support');
	//Hide "Contact Button → Community".
	remove_submenu_page('bz_button_contact', 'https://r.buttonizer.io/support/community?referral=wp-contact-button-plugin-menu');
	//Hide "Contact Button → Knowledge base".
	remove_submenu_page('bz_button_contact', 'https://r.buttonizer.io/support/knowledgebase?referral=wp-contact-button-plugin-menu');
}

add_action('admin_menu', 'plt_hide_button_contact_vr_menus', 11);

Where do I put this code?