GuyPrimavera

This open source and lightweight plugin allows users with the role Editor or Shop Manager to access the Menus and Widgets areas of the Appearance menu in WordPress’ admin area.
This is a common task that would be useful for clients to manage themselves to give them more control over their website’s content.
This plugin also gives access to the Customize submenu and other theme options, but these can be hidden through the options page at Appearance > Editor Access if you wish.
You can also select other menus to hide from Editors and Shop Managers (e.g. custom theme or plugin options pages), as well as hiding any elements on the Admin Bar.
Features
<ul>
<li>Allow access to Customize, Menus and Widgets for Editors and Shop Managers.</li>
<li>Theme Options remain hidden from these user roles.</li>
<li>Hide custom options pages from these users (if your theme/plugin has a custom settings page you wish to hide).</li>
<li>Hide any other menus or submenus. Simply select which menus you wish to hide.</li>
<li>Hide admin bar menus and elements. Choose which elements you wish to hide.</li>
</ul>

Editor Menu and Widget Access

Ideal

Allow and control Editor and Shop Manager access to the menus, widgets and appearance menu, plus other menus and adminbar items.

Pieter Bos

Whilst many people have opposed the decision, the navigation menu interface was forced into the Customizer.
As there are many people who don’t have to time to explain this to all existing clients, this plugin simply removes the menu panel/section from the Customizer.
We support this plugin exclusively through <a href="https://github.com/senlin/so-customizer-hide-menu/issues" rel="nofollow ugc">Github</a>. Therefore, if you have any questions, need help and/or want to make a feature request, please open an issue over at Github. You can also browse through open and closed issues to find what you are looking for and perhaps even help others.
If you like the Customizer Hide Menu plugin, please consider leaving a <a href="https://wordpress.org/support/view/plugin-reviews/so-customizer-hide-menu#postform" rel="ugc">review</a> or making a <a href="https://so-wp.com/donations" rel="nofollow ugc">donation</a>. Thanks!
<a href="https://so-wp.com/plugin/customizer-hide-menu" rel="nofollow ugc">Customizer Hide Menu plugin</a> by SO WP.

Customizer Hide Menu

Removes the Navigation Menu paqnel from the Customizer.

Editor Menu and Widget Access vs Customizer Hide Menu