Android I cant remove windows.

[Trick]

I been along this for a long time (i dont know if is a bug or something, but i dont think is a bug.), i cant remove any windows, i tried so many ways to remove some windows and still nothing.
Someone knows how to fix it?
I play normally with Tap to move & Auto Attack/Invisible Joystick And 2 buttons/ Joystick And Buttons.

 

[Kai*]

Use tap to move and auto attack then click and hold the item you wanna remove then it will shift to your inventory