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Another issue with the similar causes which also occurs in Android 4.3 is the difficulty to get back the functionality of the multi window feature. If previously the user will be able to bring up the multi window panel by long pressing the Back button, now in Android 4.3 the user can't do so, though they already checked the multi window option through the Settings menu. To fix this problem, you need to do another steps instead of just turned on the multi window option.
How to enable multi window feature on Android 4.3?
Below are the steps with a little tweaks revealed by a user in XDA-developer forum that you need to do to allow you brings up the multi window panel using the Back button:
- Go to Settings.
- Tap My Device.
- Tap Home screen mode.
- Select Easy mode and then followed by tapping Apply button.
- Now, go back to the Settings menu.
- Tap My Device.
- Tap Home screen mode.
- Select Standard mode and then followed by tapping Apply button.
- Now, go back to the Settings menu.
- Tap My Device.
- Tap Display.
- Enable Multi window by ticking the box next to this option. When the box is ticked means this option is enabled.
Once you've done the step above, now you should be able to open up the multi window panel by long pressing the Back button. So, hope this helps :)