This lightweight plugin hides all featured images on pages and posts when they are viewed in their own tab.
This lightweight plugin hides all featured images on pages and posts when they are viewed in their own tab. The posts are not modified -- they still have a featured image if you selected one. The plugin only disables the theme's ability to access the image when rendering the page. If your theme displays featured images in search results, Posts page, category lists, and so on, it still can do that. Social media platforms and search engines that look for an image to accompany the excerpt, can also still find the featured image URL in the post metadata.
There are no settings; the plugin just does the one thing.
The change applies to existing posts as well as anything you create after activation. You would need to edit any old posts that are adversely affected by this change (if you want the featured image to display, you would have to insert it into the content). If you have a lot of old content, you might want to use a different plugin such as Conditionally display featured image on singular pages and posts, which by default only affects new posts.
Step 1: Install it
Install this plugin by navigating Plugins -> Add New within your Admin dashboard, then searching for ' Hide featured image on all single page/post ', then click Install, then activate.
Alternatively you can head over here, download the plugin and then upload and extract it to your WordPress plugins folder.
Step 2: Use it
Use the plugin as shown in the below screenshots:
Reference
Read more here.