Andrei Zhitkov

Defining your default canonical arbitrary is most useful for those unfortunate souls who have their site URLs in punycode. This plugin allows setting a default custom URL to be used as canonical. It is designed to work with Yoast SEO only. The individual settings are still available and can be edited as before. Since it is dependent on presence of Yoast SEO, this plugin will not activate without it. 
The plugin does not add its own settings page, It uses WordPress Settings -> General. Look for it at the bottom of that page.
<h3>Technical Details</h3>
Supported versions: 
WordPress 4.x 
WordPress 5.x 
WordPress 6.x 
Yoast SEO 6.x-20.x

Custom canonical URL for Yoast SEO

This plugin allows setting a default custom URL to be used as canonical. It is designed to work with Yoast SEO only.

Web Guy

Adds the canonical link to your site (<a href="https://wikipedia.org/wiki/Canonical_link_element" rel="nofollow ugc">Learn More</a>).
Activate and then set your permalinks to “Post name” under Settings > Permalinks. That’s it.
Verify that it’s working correctly with the <a href="https://addons.mozilla.org/addon/canonical-link/" rel="nofollow ugc">Firefox add-on</a>.
Supports the ability to customize the canonical link for any specific page, post, or even custom post types (including WooCommerce Products and bbPress Topics).

Canonical Link

Adds the canonical link to your site (https://wikipedia.org/wiki/Canonical_link_element). Activate and then set your permalinks to "Post name&quo …

Custom canonical URL for Yoast SEO vs Canonical Link