Radek Mezulanik

You can lock whole website by setting it under maintenance.
Features:
<ul>
<li>
Select roles who applies maintenance mode
</li>
<li>
Set a redirect to login page
</li>
<li>
Edit a maintenance message in wysiwyg editor including media
</li>
</ul>
<h3>Sponsorship</h3>
<a href="https://www.productboard.com" rel="nofollow ugc">Productboard</a>

Zedna Maintenance Mode

Set you website under maintenance to lock content while development.

Christian Leuenberg

This plugin helps you to hide certain parts of your content like a paragraph or an image etc. to logged-out users or users of any other role with just a simple shortcode.
Customize the shortcode in order to display a special note to your users, apply custom CSS classes for your own design or hide the restricted parts completely.
Features:
<ul>
<li>text within shortcode <code>[member][/member]</code> is not visible to anonymous users</li>
<li>hide content based on user roles (subscriber, contributor, author, editor, admin)</li>
<li>restricted text can be replaced with info text box</li>
<li>info text can be customized</li>
<li>comes with a handy TinyMCE button for quick access</li>
</ul>
<iframe loading="lazy" title="WordPress Plugin: Restrict Anonymous Access" width="750" height="422" src="https://www.youtube.com/embed/n3M4C4aktuU?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Restrict Anonymous Access

Adds a shortcode to restrict content from anonymous users.

Zedna Maintenance Mode vs Restrict Anonymous Access