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.

Andrei

With <a href="https://layered.market/plugins/if-widget" rel="nofollow ugc">If Widget</a> you can control on which pages widgets are shown. Show or hide widgets with custom visibility rules (no PHP or technical knowledge required).
The plugin is easy to use, each widget will have a new option “Show widget only if” which will enable the selection of visibility rules (example in Screenshots). Visibility rules can be combined with <code>AND</code>/<code>OR</code> to create even more personalised visibility options.
<h4>Examples</h4>
<ul>
<li>Display a widget only if User is logged in</li>
<li>Hide widgets if Is mobile device <code>OR</code> Visitor is from US</li>
<li>Display widgets only for Admins and Editors</li>
<li>Hide Login or Register widgets for Logged in Users</li>
<li>Show widget only for Admins <code>AND</code> Is not mobile device</li>
</ul>
<h4>Visibility Rules</h4>
These are the visibility rules you can add for widgets:
<ul>
<li>User state: <code>User is logged in</code></li>
<li>User role: <code>User is Admin or Editor</code> (plus all the available roles)</li>
<li>User registration: <code>User registration is allowed</code></li>
<li>Post type: <code>Current post type is Post or Product</code></li>
<li>Page type: <code>Current page is Front Page or Blog Page</code></li>
<li>URL: <code>Current URL starts/ends with "this-page"</code></li>
<li>URL: <code>Current URL contains with "keyword"</code></li>
<li>Device detection: <code>Is mobile device</code></li>
<li>Visitor location: <code>Visitor is from US or Spain</code> ✱</li>
<li>Visitor language: <code>Visitor language is English or Spanish</code> ✱</li>
<li>Third-party plugin integrations: <code>Show if user is in Group "Group Name"</code>, <code>Show if user has Subscription "Example Subscription"</code> and more ✱</li>
</ul>
<h4>More Visibility Rules Add-on</h4>
The paid Add-on provides more visibility rules and priority support. 
Visibility Rules: unlock all visibility rules like: visitor location, membership status, user groups and more. A few examples are marked with ✱ above. 
Support: get one-on-one email support for any questions you may have about installing and configuring our plugins. 
Get <a href="https://layered.market/plugins/more-visibility-rules" rel="nofollow ugc">More Visibility Rules</a>.

If Widget – Visibility control for Widgets

Control what widgets your site’s visitors see, with custom visibility rules

Restrict Media Library Access vs If Widget – Visibility control for Widgets