If you don't want to receive notification from any App, what you can do is to set the Haptic vibration of that App to No No No No.For the instant, if you don't want to receive notification from Skype App then go to the Settings of the NYSW app > Haptic > set Skype vibration pattern to No No No No.After that you will receive no notification from Skype, the watch will not disturb you but you still be able to get the Skype notification on your phone.