geekwright wrote:
New Smarty variables added in XOOPS 2.5.9


$xoops_page contains a condensed version of the current page name. For example, for http://myurl/index.php, $xoops_page would be "index". For http://myurl/modules/profile/edituser.php, $xoops_page would be "profile/edituser".

$xoops_startpage contains the module configured as the start page, or "system" if no module is selected.

A "rendered" key is now set by XoopForm assign() method

Some scripts use the assign() method as an alternative to the display() method. This method assigns the form details to a stem variable named with the form's name. This assignment is done with code that looks like this:

$form->assign($GLOBALS['xoopsTpl']);

This technique has often been done to give the theme more control over the display of the form. It requires the template to loop through the individual form elements, and decide how to display it. This level of control is good if you need it, but can be a nuisance if you just want to position the form inside the page, and you would prefer the system to handle the details.

geekwright wrote:
There is a XoopsFormRendererBootstrap4 that will be included in 2.5.11

you can copy the file XoopsFormRendererBootstrap4.php into your theme's directory and use:

<?php
include_once 'XoopsFormRendererBootstrap4.php';
XoopsFormRenderer::getInstance()->set(new XoopsFormRendererBootstrap4());