How to Hide Admin Menu Tree Page View Admin Menus

function plt_hide_admin_menu_tree_page_view_menus() {
	//Hide the "Pages → Pages                    Search                                    No pages found        Sample Page												Edit					 |					View								Add new page					After					 |					Inside								Post ID: 2					Privacy Policy												Edit					 |					View								Add new page					After					 |					Inside								Post ID: 3					About												Edit					 |					View								Add new page					After					 |					Inside								Post ID: 10					Contact												Edit					 |					View								Add new page					After					 |					Inside								Post ID: 11" menu.
	remove_submenu_page('edit.php?post_type=page', 'admin-menu-tree-page-tree');
	//Hide the "Settings → AMTPV" menu.
	remove_submenu_page('options-general.php', 'amtpv');
}

add_action('admin_menu', 'plt_hide_admin_menu_tree_page_view_menus', 11);
Where do I put this code?