Jake Bresnehan

<p>This plugin provides you an easy quick way to test your content looks good at various sizes.</p>
<p>Features of the plugin include:</p>
<ul>
<li>Mobile view</li>
<li>Tablet view</li>
</ul>
<p><strong>Getting setup with the plugin</strong></p>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/bXe5_BvvtxA?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span>
<p><a href="http://web-design-weekly.com/support/" rel="nofollow ugc">Plugin Support & Feature requests</a>.</p>


Responsive Post Preview

Adds the ability to view your posts and pages at different viewport sizes with a click of a button

pressupinc

davidbhayes

<h4>Simplify Your Editing Life</h4>
<p>Requires your various post types — as specified in a simple options page — to have a featured image set before they can be published. If a lack of featured images causes your layout to break, or just look less-than-optimal, this is the plugin for you.</p>
<p>Rather than forcing you to manually enforce your editorial standards of including a featured image in every post, if your contributors fail to add a featured image to a post before publishing it they’ll simply find it impossible to publish.</p>
<h4>Setting up the Plugin</h4>
<p>By default it works on the “Post” content type only, but you can specify other content types, or turn it off for Posts in the new options page in your left sidebar: Settings > Req Featured Image. Simply check and uncheck the appropriate types, set a minimum image size if you desire, hit save and you’re all set. Happy publishing!</p>
<h4>Anything else?</h4>
<p>Don’t forget to check out <a href="http://pressupinc.com/wordpress-plugins/require-featured-image/" rel="nofollow ugc">the plugins page on our website</a>, and don’t hesitate to <a href="https://github.com/pressupinc/require-featured-image" rel="nofollow ugc">browse and fork on GitHub</a>. Have a unique WordPress project you need help on? <a href="http://pressupinc.com/contact/" rel="nofollow ugc">Get in touch with Press Up</a> to set yourself up for success.</p>


Require Featured Image

Very useful plugin

Works on WP 5.8 with build in Gutenberg editor for CPT = posts

When you remove the image the message re-appears

Does what it needs to do

Requires content you specify to have a featured image set before they can be published.

Responsive Post Preview vs Require Featured Image