Options - Users
You can access the optional settings for the "Users" module via the main menu under "Tools / Options / Users."
Options for Experts
Here you can enable the options for experts. This setting allows you to change field lengths in the Schema Manager. You can find more information here.
Database-Dependent Case Sensitivity in Filters
If this setting is enabled, the database determines whether the system is case-sensitive. If this setting is not enabled, the filters are case-insensitive; that is, entering "a" will return results that contain both lowercase "a" and uppercase "A."
More Information
Objects, Classes, and Attributes
The sections of the "Users" module
Replication - Importing Users and Groups
Active Directory Integration and Replication Configuration