All users will have the Kitchen Sink -- the second row of icons displayed in Visual mode -- for both the Page and Post Editors when Classic Editor is …

Noted That:

To install correctly this jonradio-display-kitchen-sink.zip.
Fisrt Download the jonradio-display-kitchen-sink.zip to your computer
Extract/Open jonradio-display-kitchen-sink.zip to Your Computer.
Then, Find readme.txt file inside jonradio-display-kitchen-sink.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "jonradio-display-kitchen-sink.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "jonradio-display-kitchen-sink.zip" Downloaded plugin from your computer, Where you downloaded jonradio-display-kitchen-sink.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Display Kitchen Sink" folder is added on left sidemenu. Now, Click on "Display Kitchen Sink" folder.

Noted that: If you do not see "Display Kitchen Sink" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Display Kitchen Sink Configurtions and Settings or How to work "Display Kitchen Sink" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Display Kitchen Sink" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Display Kitchen Sink
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
This section describes how to install the jonradio Display Kitchen Sink plugin and get it working. Use Add Plugin within the WordPress Admin panel to download and install this jonradio Display Kitchen Sink plugin from the WordPress.org plugin repository (preferred method). Or download and unzip this plugin, then upload the `/jonradio-display-kitchen-sink/` directory to your WordPress web site’s `/wp-content/plugins/` directory. Activate the jonradio Display Kitchen Sink plugin through the Installed Plugins Admin panel in WordPress. If you have a WordPress Network (“Multisite”), you can either Network Activate this plugin through the Installed Plugins Network Admin panel, or Activate it individually on the sites where you wish to use it. If things are not working as you expect, please look at the Other Notes (Troubleshooting section) and FAQ tabs.

This section describes how to install the jonradio Display Kitchen Sink plugin and get it working.

Use Add Plugin within the WordPress Admin panel to download and install this jonradio Display Kitchen Sink plugin from the WordPress.org plugin repository (preferred method). Or download and unzip this plugin, then upload the /jonradio-display-kitchen-sink/ directory to your WordPress web site’s /wp-content/plugins/ directory.
Activate the jonradio Display Kitchen Sink plugin through the Installed Plugins Admin panel in WordPress. If you have a WordPress Network (“Multisite”), you can either Network Activate this plugin through the Installed Plugins Network Admin panel, or Activate it individually on the sites where you wish to use it.
If things are not working as you expect, please look at the Other Notes (Troubleshooting section) and FAQ tabs.

-- , post, both, page, editors, editor, classic, mode, displayed, kitchen,

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Reffered: https://wordpress.org/