You’ll have to activate the No Disturb mode. In this way, you will not receive messages notifications but you will still be able to see if there are any unread messages on the envelop icon on the upper right-handed side of the Watch Home Screen. 

To activate the No Disturb mode:

1. Go to the Menu page of your LifeWatch and click on Settings.
2. Click on the bar next to “No Disturb” to activate it. The white circle on the bar will turn green to indicate that the feature is on.

You can also activate the No Disturb mode by simply swiping up on the Watch Home Screen and selecting the Moon icon.