Which template are you using, Siwar? T3 Blank or T3 BS3 Blank as there are some differences between the 2 templates.
The spotlight block allows you to resize module positions only, not "component" you may have to define size of the position in the spotlight block and it depends on which template you are using.
Example (t3 bs3 blank)
<!-- MAIN CONTENT -->
<div id="t3-content" class="t3-content col-xs-12 col-sm-12 col-md-8">
<?php endif ?>
<jdoc:include type="component" />
</div>
<!-- //MAIN CONTENT -->
Gardner