alpipego

This plugin makes long and complex navigation menus better manageable by creating groups that can be expanded and collapsed.
By default, all navigation menus in wp-admin will be collapsed. When holding the Option/Alt-key while clicking, all sublevels will be expanded with one click.
For general support, please use the support forums on <a href="https://wordpress.org/support/plugin/wield-menu" rel="ugc">wordpress.org</a> 
For developers: Head over to the <a href="https://github.com/alpipego/wield-menu/" rel="nofollow ugc">Github repository</a> 
For everything else, find me on <a href="https://twitter.com/alpipego" rel="nofollow ugc">twitter</a> or slack

Wield Menu

I had this problem when working on themes demo as they have all possible page in the menu.

Thanks!

Very handy

Make long and complex Navigation Menus wieldable

wepic

This plugin adds a full screen menu widget to the <a href="https://wordpress.org/plugins/elementor/" rel="ugc">Elementor Page Builder</a>. Elementor plugin must be activated to use this plugin. After you activate the required plugins, the widget will be available for use in Elementor.
<h4>Installation</h4>
<ol>
<li>Install using the WordPress built-in Plugin installer, or Extract the zip file and drop the contents in the <code>wp-content/plugins/</code> directory of your WordPress installation.</li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress.</li>
<li>Go to Pages > Add New</li>
<li>Press the ‘Edit with Elementor’ button.</li>
<li>Now you can search for “Full Screen Menu” in the left panel.</li>
<li>Next, drag and drop the widget from the left panel onto the content area.</li>
<li>Start customizing your full screen menu!</li>
</ol>

Full Screen Menu for Elementor

This plugin adds a full screen menu widget to the Elementor Page Builder.

Wield Menu vs Full Screen Menu for Elementor