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Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Issues → Custom fields → locate Group picker field.
Go to Actions → Configure → click Edit Groups++ custom field.
...
Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Issues → Custom fields → locate Group picker field.
Go to Actions → Configure → click Edit Groups++ custom field.