User search filters
You can restrict user listing by using the search filters. On the Target system address configuration page, add a search filter; for example:
Custom search expression for filtering users
userFilter="startsWith(displayName, 'M')";
The userFilter parameter should follow Microsoft’s graph API requirement: https://docs.microsoft.com/en-us/graph/query-parameters#filter-parameter
Groups to list users from
listGroups={Administrators; Sales; };
userFilter is superseded when both userFilter and listGroups are specified.
Advanced search queries (Implemented in Connector Pack 4.3)
https://docs.microsoft.com/en-us/graph/aad-advanced-queries?tabs=http