How to undo or remove a fastBlur ?

[smhk]

I simply want to blur the whole screen / whole activity (as when adding a typical menu on the left).

I guess I should use

BlurKit.getInstance().fastBlur(activity_root_view , 5, 1f);

How to undo this when the menu goes away? Thanks.

[marticztn]

I would like to know this as well UPDATE: Well it seems like there's no way to reverse the blur.