Mark Jaquith

This plugin increases the height of the category checklist meta box on the post editing screen so that all categories are shown. No more scrolling! All of your categories will be visible. If you’ve been frustrated by having to scroll to find the correct category, this plugin is for you. No options. Just install it and you’re good.

Category Checklist Expander

Increases the height of the category checklist meta box on the post editing screen so that all categories are shown.

Darken-x

After I updated WordPress to 5.3, I thought something had gone wrong with the update when I saw those borders in the admin area, the blue color of texts on the form elements and the lack of design subtlety of the UI. So I decided to create a plugin that would undo that.
The plugin styles the WordPress 5.3+ admin panel back to how it was before the 5.3 update. So, if you also disliked the vivid blue texts and strong borders of the form elements, like buttons, inputs and selects, or found them to be way too prominent, this back-to-the-good-old-days “legacy” plugin will allow you to update WordPress to 5.3 and benefit from its code updates, while still retaining all of the previous version’s backend UI styles.
Very very lightweight and easy to use.

Old Style Admin UI

Just activate the plugin and voila! you have the pre-5.3 admin buttons and tables and everything else.

Works perfectly

I absolutely can't stand the new 5.3 design... thank you SO much for giving me back the normal styling! :)

Thank you!

If you didn't like the new Wordpress 5.3 accessibility blue style for the buttons and other parts of the admin UI, this plugin is for you.

Category Checklist Expander vs Old Style Admin UI