used to have this button next to the brightness button on other devices. but on my ipad pro, there is no such button, even after deletion and re-installation of the app from appstore. could there be any solution? thx. that's really frustating with this button missing.

Thank you for using ComicGlass.

Rotation rock can't be compatible with a multitasking by the specification of iOS9.
I know that it is a troubling problem.

An option is now under consideration.

Thank you. I understand the situation. Looking foward to better solution soon.