Use the Complete meeting button to mark a meeting of a group as completed. This protects the information entered from further changes. Of course, you can undo such a conclusion and make changes.
But why would you even close a group meeting?
When you create group meetings in a group, you have the option of leaving a feedback form for these meetings. When you complete a meeting – regardless of whether you or someone else completes it – this form opens automatically and can be filled out directly.
A feedback form like this helps you to record impressions and developments. You can use it to request a wide range of information and get a good overview of your group’s development over a longer period of time.
You can find more information on feedback and group meetings on the How to configure settings for meetings in my group help page ?