how wanam exposed work?
I've just published a blog article on that yesterday you might wish to read: Xposed: The mighty Android toolbox. Amongst others, it explains some background on how Xposed works.

Basically, the framework modifies the dalvik cache at boot time (or the corresponding art stuff on Android ≥ 5). So all changes take place on boot. Thus enabling/disabling modules only shows changes after rebooting the device: if you disable a module, it's changes simply won't be applied the next time you start your device.