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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.

Jason Coleman

Andrew Lima

<h3>Install, activate, and you’re done.</h3>
This plugin hides the WordPress Toolbar (admin bar) for all visitors and users without the ‘administrator’ role. It’s a very simple plugin with no settings to configure.
<ul>
<li>Use this plugin for sites with only one admin who needs access to the dashboard and the admin bar.</li>
<li>This plugin is super lightweight, with just a few lines of code.</li>
<li>If you need to show the toolbar for other user roles, use the filter <code>habfna_show_admin_bar_roles</code>.</li>
</ul>
This plugin is a tweak of the code by Yoast to hide the admin bar for non-admins only.

Hide Admin Bar from Non-Admins

Hides the WordPress toolbar (admin bar) for all non-admin users. Simple plugin with no settings to configure.

Switch theme on admin bar vs Hide Admin Bar from Non-Admins