Keep the Last Sidebar Widget in View
Makes the last widget in the sidebar stick to the top of the screen while the visitor scrolls long posts, a good spot for a newsletter form or ad.
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.
Use the Classic Widgets Screen
Restores the classic Widgets screen and Customizer widget panel instead of the block-based widget editor.