Is there a way to Exclude a module from being searched and from being shown in the advanced search option, i.e no check box in 'Search In'?
Yes there is.
For example I'll take the mylinks module.
Open the file:
xoops_version.php from the mylinks module and look for the code:
// Search
$modversion['hasSearch'] = 1;
$modversion['search']['file'] = "include/search.inc.php";
$modversion['search']['func'] = "mylinks_search";
$modversion['hasSearch'] = [b]0[/b];
This Q&A was found on XOOPS Web Application System : https://xoops.org/modules/smartfaq/faq.php?faqid=435