Here is a WordPress snippet to exclude a Category from displaying in the Native WordPress Category Widget. Simply add this tour your functions.php: -

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// Exclude Category from Native WordPress Category Widget
function exclude_widget_categories($args){
$exclude = "1,2,4"; // The IDs 1,2,4 of the excluding categories
$args["exclude"] = $exclude;
return $args;
}
add_filter("widget_categories_args","exclude_widget_categories");
view raw Exclude Category from WordPress Category Widget hosted with ❤ by GitHub