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Quick Search And Only One Category Posting support quickly selecting category via search box when there are many categories. Besides, you can use radio button instead of checkbox when you want clients to choose 1 category only. 
Quick Search And Only One Category Posting supports all custom post types and custom taxonomy activated in theme and plugin.

Quick Search Only One Category Posting

Quick Search And Only One Category Posting support quickly selecting category via search box when there are many categories.

Label Blanc

This plugin adds a new and improved “Save” button to the Post Edit screen that, in a single click, saves the current post and immediately takes you to your next action.
(WordPress 5 info: see below for particularities for WordPress 5.)
The following actions are available:
<ul>
<li>Save and New: in a single click, saves the current post and goes to New Post Screen.</li>
<li>Save and Duplicate: saves the post, duplicates it and goes to this new post’s Edit Screen.</li>
<li>Save and List (a.k.a. Save and Close): saves the post and goes to the Posts List.</li>
<li>Save and Return: saves the post and returns you to the page where you were just before (no matter which page).</li>
<li>Save and Next: saves the post and goes to the next post’s Edit Screen.</li>
<li>Save and Previous: saves the post and goes to the previous post’s Edit Screen.</li>
<li>Save and View (same or new window): saves the post and goes to the post’s frontend page. Can show the post in the same window or in a new one.</li>
</ul>
This plugin saves you a lot of time when you have multiple posts, pages or custom posts to create or modify!
Works with pages, posts and custom post types!
Through the plugin’s settings page, you can choose which actions to show and which one to use as the button’s default action.
WordPress 5 info 
The plugin technically works with WordPress 5, but it doesn’t work with the new Gutenberg editor, which is the default editor for WordPress 5. You have to disable the Gutenberg editor to use this plugin.
Want to help translate? 
This plugin now uses the WordPress Translation Service for translations. <a href="https://translate.wordpress.org/projects/wp-plugins/improved-save-button" rel="nofollow ugc">Please visit the plugin’s page to submit your translation!</a>

Improved Save Button

Fantastic! Saves me loads of time.

Still works on WP 5.2.2, also works on custom post types that use /edit layout (e.g. Woocommerce products).

You saved me many hours of just watching the backend reload :D

This is a lifesaver

Improve your productivity with this "2-in-1" save button! It saves the post and immediately takes you to your next action.

Quick Search Only One Category Posting vs Improved Save Button