Using this plugin one can easily collapse/expand pages with children and grand children.

Admin Collapse Subpages

<p>Simple plugin that allows you to collapse subpages in the Pages admin list also for custom post types that are heirarchial. Especially helpful if you have a ton of pages /cpt&#8217;s with heiararchial set to true. It uses a cookie to save the expand/collapse status of your pages.</p>
<p>This is loosely based on Collapse Sub-Pages by Dan Dietz, which broke with the 3.0 upgrade due to UI changes and hasn&#8217;t been updated. I&#8217;ve had to rewrite the jQuery to make it work with 3.x versions.</p>
<p>Because this is a jQuery, it&#8217;s possible that they could make additional changes that would break it. I&#8217;ll do my best to stay on top of it, but let me know if it stops working.</p>
<h3>Plugin in your Language</h3>
<p>From version 2.3 our plugin supports internationalization, which means you can have plugin in your specified language.</p>
<p>It&#8217;s currently available in US English ,UK English, Chinese, Telugu , Serbian.</p>
<h3>Support us by Translating</h3>
<p>Go <a href="https://translate.wordpress.org/projects/wp-plugins/admin-collapse-subpages" rel="nofollow ugc">here</a> and translate into your language.</p>
<h3>Special Thanks</h3>
<p>We specially thank <a href="http://www.webhostinghub.com/" rel="nofollow ugc">Borisa Djuraskovic</a> for translating this plugin in Serbian Language.</p>
<p>What&#8217;s new in Version 2.0 ?</p>
<p>1)Fix en-queuing of scripts .<br />
2)Expand all , Collapse all links appear only on the pages list not on every list (like plugins ,posts etc.,)<br />
3)Updated jQuery.cookie.js to 1.4.0</p>


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