You can disable the display wake-up gesture by turning the Do not disturb mode on. You can do it from the Control menu on your fitness tracker or from the Polar Flow mobile app. If you've already set up Smart notifications with Do not disturb time period in the mobile app, you don't have to do it on your fitness tracker.
You need firmware version 1.1.15 on your Polar A360/A370 to have this feature.
To turn Do not disturb mode on from your A360/A370:
To turn the Do not disturb mode off, repeat the steps.
This will also block the smart notifications if you have the feature turned on in the Flow mobile app.
To see how Do not disturb mode and Smart notifications are set from the Polar flow mobile app, click HERE for Android and HERE for iOS.