Apple give you the choice whether to customize your notification settings or mirror those you have set up already on your iPhone.
When you get your Apple Watch, it will default to mirror your Phone; such as if your iPhone Mail app is set to notify you only of VIP emails, only VIP email notifications will appear on your Apple Watch.
The following steps are what you can do to change this default,
For built-in apps, you can customize the notifications on your Apple Watch:
- Open the Apple Watch app on your iPhone.
- Tap the My Watch tab, then tap Notifications.
- Tap an app. If you want to use different notification settings just for your Apple Watch, tap Custom.
For third-party apps, you can turn off notifications. Scroll down to the Mirror iPhone Alerts From section and turn off the setting next to that app.
Apple Support page