Hi Michael,
Is the user picker in question a custom field you've created? The user picker custom field can't filter users based on directory, but it can filter by groups. As a workaround you could configure the field to filter by a group that all of your LDAP users are included in.
Alternatively if the user picker in question is the Assignee field, you alter the "assignable user permission" for the project to only include the group of LDAP users you want to appear in the dropdown.
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