This Multi window feature In CyanogenMod 12 and above ROMs is hidden.You have to manually enable it.Don’t worry I will share full step by step guide on How To Enable Multi Window Mode in CM13 ROMs below Related Post
How to Enable Root Access on CM13
Important
→ You must have CM13 (CyyanogenMod13 ROM) On your device rootmygalaxy.net will not be held responsible for any kind of damage occurred to your Android Device while following this tutorial.Do it at your own risk. → Full Guide How To Enable Multi Window Mode in CM13 ROMs
Enable Multi Window Mode in CM13 ROMs
Step By Step Guide
First enable the Developer Option On Your device.To Do so Go to Settings –> About phone –> tap Build number seven times to enable “Developer options”. Now go back to settings, you can find the developer option there Now open developer option and slide down to menu Multi window. Just enable the multi window option and then tap on enable.Now Multi window is enabled Now got to home screen and open recent apps. You can find box icon there.Tap on it and select the 1st layout.
Done!!! Multi window is now fully functional on your CM13 device