switch

Enable and disable email notifications that WordPress sends to the admin and user. Works perfectly with many other plugins!

View the WordPress admin as a different role or visitor, switch between users, temporarily change your capabilities, set screen settings for roles.

Easily switch between themes for development and testing.

This plugin adds a sticky post switch functionality to the admin list post/custom post type pages.

Flags Icons Language Switcher.

The Menu Swapper allows you to register custom theme locations and easily swap menus on individual Pages or Posts.

Fast user switching between users and roles directly from the admin bar - switch from a list or search for users/roles by id, username, email, etc.

Switch the taxonomy for all terms or only child terms of a specified parent term.

WP User Switch is a very simple plugin which will help you to switch instantly between the user's account in a WordPress site.

Let customers toggle between inclusive and exclusive VAT pricing in your WooCommerce store.

Customize easily and switch in one-click to (native) maintenance mode from your backend or frontend.

Save time switching between posts of any post-type in wp-admin.

Switch to desktop view on smartphones.

Easily switch to any localization from GlotPress

Freesoul Switch Themes allows you to load multiple themes on the same WordPress website.

More customize option included with that.

A set of tools dedicated to post type, Post-type Switcher and Post Duplicate (works with any custom post-type).

Quickly and easily swap between themes. Adds a theme switcher to the WordPress Admin Bar with all parent/child themes, filtering and favorites list.

Adds quality switch functionality and automatic embed code generation to the wordpress video player.

As you see, these are a set of switches. You can optimize your blog by this.