The Search Forums block provides a search function for forums. It does not search other types of activities or resources. When this block is added to the site's Moodle search forums front page, it searches only the forums on the front page.
When it's added to the main page of a course, it searches only the forums in that course. It searches post titles and content.
This block is different than the Search courses field that automatically appears on the site's front page. The Search courses field searches course names and descriptions, not forums.
