Michael Adams (mdawaffe)

Just One Category will cause WordPress to display on a category archive page 
only those posts which are direct members of that category, i.e. this plugin 
will exclude from that category page all posts which belong to any of that 
category’s subcategories but do not belong to the category itself.

Just One Category

On a category's archive page, displays only the posts directly in that category, not in any sub-categories.

Sirius Pro

Simply Exclude Pages from WordPress search results and display only post in search results. This plugin allows you to exclude WordPress websites from search results without modifying the code and it works with most of the available themes. Just install and activate this plugin to exclude pages from search results in WordPress.
Read more about this plugin on <a href="https://siriuspro.pl" rel="nofollow ugc">WordPress</a> blog.

Exclude Pages from Search Results

Simply Exclude Pages from WordPress search results and display only post in search results.

Just One Category vs Exclude Pages from Search Results