How to Hide CBX Bookmark & Favorite Admin Menus

function plt_hide_cbxwpbookmark_menus() {
	//Hide "CBX Bookmarks".
	remove_menu_page('cbxwpbookmarkdash');
	//Hide "CBX Bookmarks → Dashboard".
	remove_submenu_page('cbxwpbookmarkdash', 'cbxwpbookmarkdash');
	//Hide "CBX Bookmarks → Bookmarks".
	remove_submenu_page('cbxwpbookmarkdash', 'cbxwpbookmark');
	//Hide "CBX Bookmarks → Categories".
	remove_submenu_page('cbxwpbookmarkdash', 'cbxwpbookmarkcats');
	//Hide "CBX Bookmarks → Setting".
	remove_submenu_page('cbxwpbookmarkdash', 'cbxwpbookmark_settings');
}

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

Where do I put this code?