Jason

<p>This plugin solves the problem of when you have long pages/posts/custom posts edit screens in the WordPress admin, usually caused by lots of custom fields or plugins. Whenever you get down to the bottom of the page you need to scroll back up to the top to press the update or publish button. This plugin solves this problem by automatically scrolling the sidebar into view as you scroll the page.</p>


Sticky Admin Sidebar

Simple, but very useful. Still works with WP 5.2 (you should SVN an update to the readme).

Still works

WordPress plugin to stick the post sidebar in wp-admin so it's always in view

Maeve Lander

<p>This simple button creator lets you create one or more floating buttons that stick to the side of your site as the user scrolls.</p>
<h4>Use it for sticking information like:</h4>
<ul>
<li>Phone number</li>
<li>Email address</li>
<li>Social icons</li>
<li>Store locations</li>
</ul>
<h4>Configuration options include:</h4>
<ul>
<li>Button position > left or right</li>
<li>Rollover style > darken or lighten</li>
<li>Animation style > none, slide or icons only</li>
<li>Disable on mobile (optional)</li>
<li>Customise button icons, text, link, and colors easily</li>
<li>Show on: Front Page, Pages, Posts, Custom Post Types (checkboxes)</li>
</ul>
<h4>Demo</h4>
<ul>
<li><a href="http://demo.enigmaweb.com.au/" rel="nofollow ugc">Click here</a> for out-of-the-box demo. You can see the buttons to the right of the screen, in ‘slide’ mode.</li>
</ul>


Sticky Side Buttons

Works great

Flexible button creator allowing you to stick floating buttons to the side of your site.

Sticky Admin Sidebar vs Sticky Side Buttons