Tryon Eggleston

Sort My Sites lets you change the ordering of the My Sites menu on the dashboard and in the admin bar.
Options:
<ul>
<li>Sort by None, Site ID, Site Name, Domain, Site Path, Site URL</li>
<li>Case Sensitive Sorting</li>
<li>Keep the primary site at the top of the list</li>
</ul>

Sort My Sites

Sort My Sites lets you change the ordering of the My Sites menu on the dashboard and in the admin bar.

kodeala

Reorder Multisite Sites Dropdown gives WordPress Multisite administrators a powerful tool to organize the My Sites dropdown in the WordPress Admin Bar. With this plugin, you can customize how sites appear in the admin bar so they are easier to find and better organized for your workflow. It is especially useful for WordPress Multisite networks with many sites where the default alphabetical ordering becomes difficult to manage, enhancing the existing WordPress multisite admin bar experience without modifying WordPress core functionality.
With this plugin, you can:
<ul>
<li>Reorder sites in the My Sites dropdown using drag-and-drop.</li>
<li>Manually set ordering using number input fields for quick repositioning.</li>
<li>Create groups to organize related sites together.</li>
<li>Add divider lines to visually separate sections.</li>
<li>Nest sites inside groups for better structure.</li>
</ul>
The ordering interface is available in the Network Admin under Settings > Reorder My Sites

Reorder Multisite Sites Dropdown

Adds advanced ordering controls to the WordPress Multisite My Sites admin bar dropdown, allowing administrators to organize sites with drag-and-drop,  …

Sort My Sites vs Reorder Multisite Sites Dropdown