How to Hide the "Content Visibility For Divi Builder API Reference" Admin Menu

function plt_hide_content_visibility_for_divi_builder_menus() {
	//Hide the "Tools → Content Visibility For Divi Builder API Reference" menu.
	remove_submenu_page('tools.php', 'content-visibility-for-divi-builder-api-reference');
}

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

Where do I put this code?