Vlad Zelinskyi

Flavor Block Visibility adds three simple toggle switches to the Advanced panel of every Gutenberg block:
<ul>
<li>Hide on Desktop — hides the block on large screens</li>
<li>Hide on Tablet — hides the block on medium screens</li>
<li>Hide on Mobile — hides the block on small screens</li>
</ul>
<h4>Features</h4>
<ul>
<li>Works with every core and third-party Gutenberg block</li>
<li>Controls appear in the native Advanced panel — no extra sidebars</li>
<li>Customizable breakpoints via Settings → Block Visibility</li>
<li>Lightweight — CSS is only loaded on pages that actually use visibility toggles</li>
<li>Visual indicators in the editor show which blocks have visibility rules</li>
<li>No JavaScript on the frontend — pure CSS media queries</li>
<li>No build step required</li>
<li>Clean uninstall — removes all plugin data</li>
</ul>
<h4>Default Breakpoints</h4>
<ul>
<li>Mobile: 0 – 767px</li>
<li>Tablet: 768px – 1024px</li>
<li>Desktop: 1025px and above</li>
</ul>
Breakpoints can be customized in Settings → Block Visibility.

Flavor Block Visibility

Adds responsive visibility toggles to every Gutenberg block. Hide blocks on Desktop, Tablet, or Mobile right from the Advanced panel.

Alvaro Gómez

This plugin restricts access for Authors and Contributors so they can only see their own Media Library uploads.
This has two main uses: Make it easier for Authors to locate their own uploads when Media Libraries grow very big and prevent Authors from using or downloading media that belongs to other users.
Admins and Editors will still be able to see everyone’s uploads.

Restrict Media Library Access

Muy útil

This plugin works fine in WP 5.7.1 

It's just the example code from the official WP docs for the ajax_query_attachments_args filter, with a line added to check if the current user is an administrator. It's very simple.

There's no reason this plugin shouldn't work in an up-to-date WP installation

works in WP 5.7.1

Restricts access for Authors and Contributors so they can only see their own Media Library uploads.

Flavor Block Visibility vs Restrict Media Library Access