BjornW

This plugin will disable the Core Block Patterns, included with WordPress 5.5 (and higher versions). Even if your theme enables them, this plugin will overrule your theme and disable Core Block Patterns. It will not disable any custom or plugin Block Patterns. The plugin has no settings and should work in WordPress MU as well as single WordPress installations.
If this plugin meets your expectations and you use it commercially 
please consider a donation to one of these organisations or your country’s equivalents:
<ul>
<li><a href='https://www.msf.org/' rel="nofollow ugc">Medicines Sans Frontiers</a> </li>
<li><a href='https://fsfe.org' rel="nofollow ugc">Free Software Foundation Europe</a></li>
<li><a href='https://https://www.bitsoffreedom.nl/english/' rel="nofollow ugc">Bits of Freedom</a></li>
<li><a href='https://edri.org/' rel="nofollow ugc">European Digital Rights (EDRi)</a> </li>
<li><a href='https://fsf.org' rel="nofollow ugc">Free Software Foundation</a></li>
<li><a href='https://eff.org' rel="nofollow ugc">Electronic Frontier Foundation</a></li>
</ul>
<h3>Notes</h3>
Credits:
Icon in the WordPress plugin repository and found in /assets/icon* uses <a href="https://www.toicon.com/icons/afiado_build" rel="nofollow ugc">‘To Build’ icon</a> licensed under a <a href="http://creativecommons.org/licenses/by/4.0/" rel="nofollow ugc">Creative Commons Attribution 4.0 International</a> License. Derived from the series <a href="https://www.toicon.com/series/afiado" rel="nofollow ugc">‘Afiado’</a> By <a href="https://www.toicon.com/authors/susana" rel="nofollow ugc">Susana Passinhas</a>
Thanks Susana Passinhas and to[icon] for sharing your work!
WordPress repository header image found in /assets: 
<a href="https://archive.org/stream/annualreportofbu38smithso/#page/359/mode/1up" rel="nofollow ugc">‘A cropped elment from Fig 173 from page 359 of “Annual report of the Bureau of American Ethnology to the Secretary of the Smithsonian Institution” (1895)’</a>. No known copyright restrictions. Cropped by BjornW. 
Found via Flickr Commons – flickr.com/commons on Internet Archive.org (thanks!)

Disable Core Block Patterns

This plugin will disable the Core Block Patterns, included with WordPress 5.5 (and higher versions).

BlockMeister

Benny

With BlockMeister creating custom block patterns becomes easy. The patterns can be designed just like you design a blog post or a page with the block editor. 
You can assign any (custom) category or keywords. By doing so, your patterns are categorized in a way that makes sense to your users and keywords make it easier to find a pattern. Your custom patterns will be available from the block patterns tab in the inserter panel.
Features
<ul>
<li>Visual design custom block patterns using the pattern builder</li>
<li>Or create a custom pattern from one or more selected blocks in the post editor</li>
<li>Import patterns made/shared by trusted Pro users [new in 3.0]</li>
<li>Assign your patterns to one or more categories</li>
<li>Optionally add any keywords (makes them easy to find in the block inserter)</li>
<li>Create custom pattern categories</li>
<li>Set a viewport width to optimize the scaled width of the preview in the block inserter</li>
</ul>
Pro Features 
If you would like even more features like: group locking, cloning, activating or deactivating individual patterns, exporting, importing, controlling which core/third party pattern sets are allowed to load, setting block styles and more, please check out our premium versions here: 
<a href="https://wpblockmeister.com/#info-pro" rel="nofollow ugc">Professional Version</a>
<h3>Getting Started</h3>
<ol>
<li>Locate and click on the ‘Block Patterns‘ menu item in the sidebar admin menu.</li>
<li>Click on the ‘Add New‘ button.</li>
<li>Give your pattern a name.</li>
<li>Start writing or choose any blocks you want to be part of your pattern.</li>
<li>Publish the pattern</li>
<li>Go to a test page and locate your pattern in the Block Inserter under the pattern tab and click on it.</li>
<li>The block pattern will now be added to your page. All contained blocks are now independent of the original pattern and can be edited as any regular block.</li>
</ol>

BlockMeister – Block Pattern Builder

Visually create custom block patterns. No coding skills needed! Categorize them easily and use keywords for easy discoverability.

Disable Core Block Patterns vs BlockMeister – Block Pattern Builder