Anthony Eden

When Facebook crawls your site, it uses the Canonical URL and links directly to this in all Facebook posts. This plugin prevents 
Facebook from seeing the Custom Canonical URL entered into the Yoast SEO plugin. This means it will always 
link to your own website, even if you’ve set the Canonical URL to another site.

Remove Yoast Canonical URL for Social

This plugin removes manually entered Yoast SEO Canonical URLs when social media networks such as Facebook crawl any page on your website.

Claudio Di Totaro

<blockquote>
Modify or set the canonical URL and meta keywords in the Quick Edit interface of posts and pages.
</blockquote>
This plugin lets you modify or set the meta tags of the canonical URL and meta keywords in the Quick Edit interface of each post or page.
Why do I need to set the canonical URL? 
If you use a subdomain and point it to specific pages / posts then WordPress automatically sets the canonical URL to the main domain (usually www.), but for SEO and indexing reasons you may want to set the canonical URL to the subdomain instead.
Why do I need to set Meta Keywords? 
It helps Search Engines to index your content better, especially when you have important content which is generated automatically on the page and is not part of the HTML.
<h4>Basic Features</h4>
<ul>
<li>Go to Posts or Pages, click on Quick Edit and maintain Canonical URL or Keywords (multiple comma separated)</li>
</ul>
<h4>Support</h4>
To get your queries resolved related to ‘Custom Canonical URL and Keywords Modifier’, you can always take help from <a href="https://ditotaro.wordpress.com/ccuakm" rel="nofollow ugc">Support.</a>

Custom Canonical URL and Meta Keywords Modifier

Modify or set the canonical URL and meta keywords in the Quick Edit interface of posts and pages.

Remove Yoast Canonical URL for Social vs Custom Canonical URL and Meta Keywords Modifier