The Samsung Galaxy Note 4 with its large display can be optimally used to display two apps simultaneously on the screen. Therefor the "Multi Window" option is implemented in Android lollipop. With multi window you can simultaneously display two apps on the screen and thus operate parallel. If you have activated MultiWindow on your Samsung Galaxy Note 4 via Menu --> Settings --> Multi Window then it may be that you no longer see the multi-window display bar.
This bar will automatically disappear after each interaction, so as not to obscure the currentlydisplayed screen.
We show you now how the multi-window bar in Android Lollipop can be displayed quickly and comfortably again. It works like this with this button:
Hold the back button (right soft key) pressed and wait until the bar appears on the right side of the screen. Finish!
You know now how display the Multi Window toolbar on the Samsung Galaxy Note 4 again.