Igor Benic

Multisite Featured Image changes the box of the featured image for all sites. It can be used also in a single instance of WordPress and not a MU installation.
This plugin changes the box in the way that the default pop-up is replaced with the classic Media Uploader where you can choose images. Images From URL do work.
For a greater Multisite experience you can combine this plugin with the <a href="https://wordpress.org/plugins/network-shared-media/" rel="ugc">Network Shared Media plugin</a> and have a complete Media Sharing site.
Read about it on this <a href="http://siderrz.com/wordpress-multisite-shared-featured-image/" rel="nofollow ugc">article</a>.
<h4>Features</h4>
<ul>
<li>Using WordPress Media Uploader to set Featured Image</li>
<li>You can set an image from URL</li>
<li>Images from URL will be downloaded into the WordPress Media and it can be used for anything else inside WordPress</li>
<li>Downloaded images are saved in every registered image size </li>
<li>You can set the Main site on which you will download the images in a MU installation</li>
</ul>

Multisite Featured Image

Multisite Featured Image changes the box of the featured image so that you can use the classic Media Uploader also with Network Shared Media.

zeninvader

This WP plugin hides the featured image on a single post or page.
The plugin adds a checkbox to the “Featured Image” section on edit pages. Once checked, the featured image will be removed from individual posts and pages.
This plugin works on WordPress Gutenberg and also on Classic Editor.
It adds the “Hide featured image” checkbox to posts, pages, custom post types and also to WooCommerce products.
It is tested and works on latest WP version 6.1.1
If you need more info please check the plugin on <a href="https://www.zeninvader.com/hide-featured-image-wordpress/" rel="nofollow ugc">Zen Invader</a> website.
<a href="https://www.zeninvader.com/hide-featured-image-wordpress/" rel="nofollow ugc">Go to plugin’s page</a> if you have other questions or suggestions.

ZI Hide Featured Image

This WP plugin hides the featured image on a single post or page.

Multisite Featured Image vs ZI Hide Featured Image