WebHostingHero

This plugin displays a drop down menu in the admin dashboard that allows you to filter the page list by their parent page. No configuration is necessary.

Parent Page Filter

It's a simple plugin and does the job, but only if WP_DEBUG is disabled.
The two main issues I have with this plugin are:

It assumes that $_GET['post_type'] exists and/or is set, when it mightn't, which throws PHP warnings and sometimes actually halts page load, here and here.

Not ready for translation

(I am happy to patch by the way, a GH repo would be nice)



Works ok-ish, needs a few tweaks

This plugin allows you to filter pages by parent in the admin dashboard.

mahmoud791

This plugin customizes the parent page dropdown in the page attributes meta box, limiting it to top-level pages with no parent. 
Enjoy using the “Custom Page Attributes” plugin! If you have any questions or need support, please contact Mahmoud Mustafa via email at mahmoudxmostafa@gmail.com, or connect on <a href="https://www.linkedin.com/in/theseolad/" rel="nofollow ugc">LinkedIn</a> and <a href="https://twitter.com/MahMustafa79" rel="nofollow ugc">Twitter</a>.
Donations
If you find this plugin helpful and would like to support further development, consider buying me a coffee! <a href="https://www.buymeacoffee.com/mahmoud791" rel="nofollow ugc">Donate here</a>.

Custom Page Attributes

Customize the parent page dropdown in the page attributes meta box to show only top-level ones with no parent.

Parent Page Filter vs Custom Page Attributes