Turn off Manual Headcount
Manual Headcount is turned on by default for each project.
When Manual Headcount is turned on, it means that you can add anonymous progress into a story and you can do it in two scenarios:
From the Survey Campaign page by selecting Add manual headcount
From the Quick Update popup - it lets you add Manual Headcount alongside progress about tagged contacts
Steps to turn off Manual Headcount
Go to the Project Preferences page of the project in which you want to turn off Manual Headcount
Tick the “Hide the anonymous participants section on create story pages if there are project contacts” tick-box
Scroll to the bottom and press Save