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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.

kubiq

Fix the broken layout when too many items are displayed in your admin bar, remove the annoying top margin, hide some unnecessary items from your admin bar
<ul>
<li>fix multiline admin bar</li>
<li>remove 32px margin inserted by WordPress</li>
<li>hide admin bar for any user role</li>
<li>hide admin bar on smaller screens</li>
<li>hide admin bar items that you do not need</li>
<li>
 select from 3 admin bar styles:
<ol>
<li>ghost – set lower opacity and smaller height and expand it on hover</li>
<li>vertical – show admin bar as icons in a vertical panel and expand it on hover</li>
<li>icon – hide admin bar into a single small icon and expand it on hover</li>
<li>bottom – move admin bar to the bottom of your screen, you can also set similar things like in the ghost style</li>
</ol>
</li>
<li>
 settings:
<ul>
<li>Position</li>
<li>Inactive opacity</li>
<li>Inactive size</li>
<li>Animation duration</li>
<li>Mouse enter delay</li>
<li>Mouse leave delay</li>
</ul>
</li>
</ul>

Admin Bar Fix

Fix broken layout when too many items are displayed in the admin bar, remove annoying top margin, hide some unnecessary items from your admin bar

Switch theme on admin bar vs Admin Bar Fix