HELLO FRIENDS , I KNOW MOST OF YOU ARE SEARCHING FOR AN APP FOR THE MULTIWINDOW ON YOUR ANDROID SMARTPHONE BUT DIDN'T SUCCEED YET .
HERE IS THE SHORT TUTORIAL TO USE MULTIWINDOW LIKE SAMSUNG'S GALAXY'S SMARTPHONES ON YOUR ANDROID PHONES OR TABLETS .
REQUIREMENTS
1 YOUR PHONE SHOULD BE ROOTED[ click here to see procedure]
2 XPOSED INSTALLER  [ click here to download]
3 XMULTIWINDOW [click here to download]

STEP 1
Root your android device

STEP 2
Install Xposed Installer and Xmultiwindow , you can download these from the links above in requirements .

STEP 3
Open Xposed Installer
Go to Xposed module --> tick the Xmultiwindow

Now , Go to Framework-->tap on Install/Update--> soft reboot


STEP 4
Once you have done the above steps , you can use multiwindow now
Open Xmultiwindow -->Side bar app setting-->Add apps for side bar

and tap Open side bar


STEP 5
you can now use multiwindow , 
Move your hand as show in below screen shot to appear side bar ,

click on any app and add to Up Workspace/ Down Workspace

IF YOU LIKE THIS POST , DON'T FORGET TO RECOMMEND THIS POST ON GOOGLE