
Allows part of a post title to be styled as a subtitle. It is still within the title heading, but is wrapped in a span to be styled differently.
This plugin adds a Visual Subtitle field to all post, page and custom post types that have support for a title, and that use the Classic Editor. It doesn’t work with the Block Editor.
It allows you to include a string of text that will still be part of the post title, but be wrapped in a span tag, giving something like:
<h1>Visual Subtitle<span class="subtitle"></span></h1> Keeping it as part of the main level 1 or two heading, means it maintains as much keyword SEO importance as the main title, yet can be given a style (in your own theme) of display: block; to make it visually appear as a subtitle.
The visual subtitle is appended to to the title on on the Posts screen, separated with a pipe (|) character, and appended to the title part of the document title with a colon (:) character.
visual-subtitle folder to the /wp-content/plugins/ directory.
The back-end interface, showing the Visual Subtitle field.

Showing the visual subtitle on the front-end, in this case, styled red, smaller, italic and bold.

The front-end markup, showing the span inside the existing heading element (may differ for your own theme).

Showing the subtitle in the Posts list - the second entry has no subtitle.

The subtitle can also be amended from the quick edit feature.
Only currently by amending the plugin code.
You need to add the .subtitle { display: block; } style to your own theme, along with any other styling you want for it.