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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.

KZeni

Fixes the wrap behavior of the WordPress admin bar when it has too many items. Keep it neat; don’t spill/overflow into the content.
Check things out on GitHub at <a href="https://github.com/KZeni/Admin-Bar-Wrap-Fix" rel="nofollow ugc">https://github.com/KZeni/Admin-Bar-Wrap-Fix</a>

Admin Bar Wrap Fix

Fixes the wrap behavior of the WordPress admin bar when it has too many items. Keep it neat; don't spill/overflow into the content.

Switch theme on admin bar vs Admin Bar Wrap Fix