Makoto

Low-Key ToolBar makes the block editor toolbar less noticeable and improve block editor UX.
I think block editor toolbar is useful, but too big and too conspicuous and disturbing. 
Sure, top toolbar mode is not disturbing, but is not user-friendly.
This plugin add its own setting sidebar to block editor and You can control scale, opacity, vertical position of the block editor toolbar.
By adjusting these properteis, the toolbar will be less noticeable, and it will improve UX.

Low-Key ToolBar

This plugin makes the block editor toolbar less noticeable and improve block editor UX. You can control Scale, Opacity, Vertical Position of the block …

Barry Kooij

Never5

What The File adds an option to your toolbar showing what file and template parts are used to display the page you’re currently viewing.
You can click the file name to directly edit it through the theme editor, though I don’t recommend this for bigger changes.
What The File supports BuddyPress and Roots Theme based themes.
More information can be found <a href='http://www.barrykooij.com/what-the-file/' rel="nofollow ugc">here</a>.
<h4>Looking for a great related posts plugin for WordPress?</h4>
Another plugin I’ve built, that I’m very proud of is Related Posts for WordPress. Related Posts for WordPress offers you the ability to link related posts to each other with just 1 click! And it’s 100% free! <a href="https://wordpress.org/plugins/related-posts-for-wp/" rel="ugc">Check it out on the WordPress repository.</a>

What The File

This is great plugin to check templates file. It saves a lot of development time with 100% accuracy for me. Thanks to the developers team who worked for this plugin. Every WordPress developer should have this installed during development tier of their website.

Simple, but superb plugin

cool. very helpful !!!!

What The File is the best tool to find out what template parts are used to display the page you're currently viewing!

Low-Key ToolBar vs What The File