What can you do to Switch Quickly to another App?!
You should Leave Current app and then find & Select Another app.
By using this Application, you can create *Floating Shortcuts* of your Favorites Apps & It doesn't limit you to any boxes or toolbars.
Furthermore, you can create Floating Widgets, Floating Categories & Floating Bookmarks of Website (Read it Offline in Floating View)

OK Google! Open Shortcuts
Open the App using OK Google! Voice Command to Recover All Floating Shortcuts

Features
+ Shortcuts for All Activities & Actions (Press & Hold on Floating Shortcuts)
+ Floating Categories: Move it to Right-Edge to Automatically Minimize it
+ Automation Features:
- Apps for Time
Shortcut of selected App will create at the specific time every day until user cancels it.
For Example, You Set to Create Floating Shortcut of 'Messaging App' at 10:30.
- Apps for WiFi
- Apps for Bluetooth
- Apps for GPS
You can select Necessary Apps from the List to have Floating Shortcuts of them When turning on the WiFi, Bluetooth & GPS
+ 'Floating Shortcuts Launcher' for Smartphones
+ 'Floating Shortcuts Face' for Smartwatches

Tip: To Remove Shortcut Long Press on Floating Icon to See Close ( X ) Icon & Reclick to remove it.

Recommendation: Set 'Floating Shortcuts' as Default Launcher & Watch Face to have 'Minimalistic & Smart Launcher' Suitable for Floating Views.

Preferences
+ App Theme Color: Selected Automatically from Wallpaper
+ App Drawer Style
+ Transparent App Theme
- Light
- Dark
+ Shortcuts Size
+ Shortcuts Transparency

/*
* Your SmartPhone Wallpaper reflects your Moods & I Respect it.
* Shortcuts App Colors will Change to What you are in Mood for... 😉
*/

/*
* You can also create Floating Shortcuts of Installed Apps on Android Wear Smart Watches
*/

Tip: To Remove Shortcut Long Press on Floating Icon to See Close ( X ) Icon & Reclick to remove it.
Tip: To Get Activities Shortcut of App Press & Hold Until See the List.
Tip: Steady Mode: Automatically Start & Stop. It will Start on First Floating View creation & will Stop when you remove Last Floating View.
Tip: Long Press on Home Screen to See Launcher Setting
- Setup Swipe Gestures to Recover Floating Shortcuts Or Open Status Bar
- Select Quick Bar App

/*
* Open Source Project of Floating Shortcuts on Xda-Devs
* http://forum.xda-developers.com/android/apps-games/app-floating-shortcuts-t3019241
*
* Please Write your Opinion to Improve current Features & to Add New Features
*/