A Cohort is an optional field in the visit screen. It can be used to collect any additional information like patient cohort name, event cycle, etc. The values of the Cohort dropdown is configured at the system level. In the future, we plan to support configuring the values at the CP level.
The user can add dropdown PVs for the cohort field using 'Dropdown Manager' or from the database into a PV table. The 'Cohort' field is only visible on the visit page on UI if one or more PVs are added in the dropdown.
To add Permissible Values for 'Cohort' dropdown, refer 'Dropdown Manager'.