m-viper Hi
I will explain a bit here that in the layout of this frontpage of JomSocial, the js_side_top / js_side_top_stacked positions are included in the sidebar so it's not possible to enlarge that section only, you will need to enlarge the whole sidebar.
If you want to show content across sidebar and the main section, you can consider to add a new module position into that place. Try these steps:
1/ Create a new position called myposition or any name into the XML file of template:
/templates/your_joomla_template/templateDetails.xml
2/ Open layout file of the JomSocial template you're using, if you're using 'jomsocial' template, open this file:
/components/com_community/templates/jomsocial/layouts/frontpage/base.php
under the body tag, add this line of code to render the new position there, it will look like this:
<div class="joms-body">
<div><?php $this->renderModules('myposition'); ?></div>
<?php if ($moduleCount > 0) { ?>
<div class="joms-sidebar">
<div class="joms-module__wrapper"><?php $this->renderModules('js_side_top'); ?></div>
<div class="joms-module__wrapper--stacked"><?php $this->renderModules('js_side_top_stacked'); ?></div>
In backend, I assign a banner module to this new position and here is how it looks on frontpage:
