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This plugin adds Theme menus in the admin bar. 
You can switch and activate the theme on the admin bar. 
You don’t need to go to the administration screens to switch the theme.
(For Japanese User) 管理バーにテーマメニューを追加します。 管理バー上でサイトテーマの変更・有効化が行えます。 テーマを変更するために管理画面に行く? 要がなくなります。

Switch theme on admin bar

This plugin adds Theme menus in the admin bar. You can switch and activate the theme on the admin bar.

Linesh Jose

This is a simple plugin for adding custom nav menus to your WordPress Adminbar. Please note this: Custom Adminbar Menus plugin is only compatible for WordPress 3.3 or above versions. Please update your WordPress if you’re using an old version. Watch <a href="https://bit.ly/2kU1HO5" rel="nofollow ugc">this video</a> for more details or visit https://linesh.com/forums/forum/plugins/custom-adminbar-menus/ for support.
Features
<ul>
<li>WordPress Multisite Compatible.</li>
<li>More WordPress admin shortcut links under “Site Menu” & “Add New” sections. <a href="https://wordpress.org/plugins/custom-adminbar-menus/screenshots/" rel="ugc">Screenshot 2 & 3 </a>.</li>
<li>Easy to use.</li>
</ul>

Custom Adminbar Menus

This is a simple plugin for adding custom navigation menus to your WordPress Adminbar.

Switch theme on admin bar vs Custom Adminbar Menus