I am creating a new watch app and there is an option "Include Glance Screen". I tried searching for it but not able to get it what it do. What effect it will make on checking.
It will create a GlanceController source code file and a Glance interface controller in the storyboard.
If you need generic info about glances, you can check:
https://developer.apple.com/watch/human-interface-guidelines/app-components/#glances