Try this
How to Enable Multi-User Support by Editing the Build.Prop File:
To begin, you will need to tweak the build.prop file on your device’s partition. If you have root access, then download and install the BuildProp editor application and grant root permissions.
Next, launch the BuildProp Editor App. Tap on the pen icon that is located at the top right corner to proceed to edit the build.prop file.
Now that you have opened up your build.prop file in editing mode, scroll all the way down to the bottom and add the following lines to it;
fw.max_users=3
fw.show_multiuserui=1
When you have successfully done that, click on the save icon located in the top right corner and tap “save & exit”
Once this is done, reboot your device and the changes will occur. You should now have the multiple user accounts feature in the “Quick settings” page in your Android smartphone.
To set it up, just swipe down from the top edge of your phone with your two fingers to fully expand the notification bar, tap the user icon, then you can either add a new account or use” Guest”.