zggz

If your theme makes thumbnail pictures links (which casuses a useless refresh on click), 
use this plugin to disable that. That’s it. Once enabled, it will make every featured image 
(on a post/page) unclickable.
<h3>Contributing</h3>
If you have any requests, bugs, or improvements, leave them at the GitHub for this plugin 
<a href="https://github.com/zggz/unclickable-featured-image" title="GitHub Repository" rel="nofollow ugc">GitHub repo link</a>

Unclickable Featured Image

A WordPress plugin that forces all featured images to NOT be links

Shane Bishop

Pedro Elsner

Force Regenerate Thumbnails allows you to delete all old images sizes and REALLY regenerate the thumbnails for your uploads.
Regenerate all thumbnails from the Tools admin menu. Regenerate batches of images via the Media Library list mode. Select the images to regenerate and then use the Bulk Actions drop-down menu to Force Regenerate Thumbnails. Use attachment actions to regenerate thumbnails for a single image.
Several filters exist for advanced usage. See more via <a href="https://gist.github.com/nosilver4u/eb858df10521aece2044a3a15ccdd17b" rel="nofollow ugc">this gist</a>.
You may report security issues through our Patchstack Vulnerability Disclosure Program. The Patchstack team helps validate, triage and handle any security vulnerabilities. <a href="https://patchstack.com/database/vdp/force-regenerate-thumbnails" rel="nofollow ugc">Report a security vulnerability.</a>

Force Regenerate Thumbnails

Delete and REALLY force thumbnail regeneration.

Unclickable Featured Image vs Force Regenerate Thumbnails