Enum FieldUserSelectionMode
Specifies whether users and groups or only users can be selected. https://docs.microsoft.com/en-us/previous-versions/office/sharepoint-csom/ee545809%28v%3doffice.15%29
Namespace: PnP.Core.Model.SharePoint
Assembly: PnP.Core.dll
Syntax
public enum FieldUserSelectionMode : int