Excluding Category From Widget

https://www.ads-software.com/support/topic/exclude-specific-categories-from-sidebar-categories-widget?replies=5

Found this link searching your post title in google. Give the plugin mentioned there a shot.

thnx for the quick reply. I also found several plugins, but I prefer code. After searching for a while, I found the following code, which should be placed in MYTHEME/functions.php.

<?php
function exclude_widget_categories($args){
$exclude = “3,6,18”; // The IDs of the excluding categories
$args[“exclude”] = $exclude;
return $args;
}
add_filter(“widget_categories_args”,”exclude_widget_categories”);
?>

Nice solution Foosho!