Categories Widget: Top Level Only, Busiest First
Makes the Categories widget list only top-level categories and sorts them by number of posts, so a long category tree becomes a short list of your main sections.
Snippet Library
Widgets snippets for WordPress
Snippets for widgets and sidebars: restore the classic widget screen, register new widget areas, remove default widgets and allow shortcodes in text widgets. For classic themes and sites that still lean on sidebars.
Exclude Categories From the Categories Widget
Hides chosen categories from the classic Categories widget list or dropdown.
Exclude a Category From the Recent Posts Widget
Keeps posts from the categories you choose out of the classic Recent Posts widget, for example sponsored posts or internal news.