Abhay Rautela

The Query Loop block in WordPress does not include a “Random” ordering option in the sidebar UI. 
However, WordPress core does support <code>orderby = rand</code> in <code>WP_Query</code>.
The problem: 
Using <code>"orderBy": "rand"</code> inside a Query Loop block can cause the Site Editor preview to fail, because <code>rand</code> is not included in the REST API schema for posts.
This plugin fixes that by extending the REST API orderby enum so the editor recognizes <code>"rand"</code> as valid.
<h3>✔ What this plugin does</h3>
<ul>
<li>Adds <code>"rand"</code> to the REST API <code>orderby</code> enum for posts and pages. </li>
<li>Allows the Query Loop block to use <code>"orderBy": "rand"</code> safely. </li>
<li>Prevents JSON errors and broken previews in the Site Editor. </li>
<li>Makes “random post” layouts work reliably both in the editor and frontend.</li>
</ul>
<h3>⚠ What this plugin does not do</h3>
<ul>
<li>It does not add a “Random” option to the Query Loop UI dropdown. 
(That UI is defined in Gutenberg’s JavaScript.)</li>
<li>You must still set <code>"orderBy": "rand"</code> manually using the Code Editor.</li>
</ul>
<h3>Example use case</h3>
Want your homepage, blog, quotes site, testimonials, or featured-section to show 
a different post every time the page loads?
Install this plugin → open the template → switch to Code Editor → set <code>"orderBy": "rand"</code>.

Random Posts for Query Loop Block

Adds "rand" to the REST API orderby options so the Query Loop block can use random post order safely without breaking the Site Editor preview.

Chip Bennett

This plugin will allow you to customize the number of posts, orderby, and order parameters for all index page contexts, including the blog posts index, search index, and all archive indexes (category, tag, taxonomy, author, date, archive). Orderby settings support all values relevant to archive index pages, including none, ID, author, title, name, date, modified, rand, and comment_count. Order settings support ASC and DESC.
Note: Plugin settings can be configured via Dashboard -> Settings -> Reading.

cbnet Different Posts Per Page

Customize the number of posts, orderby, and order parameters for all index pages (blog/home, search, category, tag, taxonomy, author, date, and archiv …

Random Posts for Query Loop Block vs cbnet Different Posts Per Page