We would need to remove the paging configuration defined for our Corporate Directory:
1. From the management console (immanage), export the corporate directory.
2. Open the corporate directory XML using a file editor, and look for the section where the directory search is defined
<DirectorySearch maxrows="xxxxx" maxpagesize="2000" minsortrules="1"/>
3. Remove the maxpagesize so it shows
<DirectorySearch maxrows="xxxxx" minsortrules="1"/>
4. Reimport the modified corporate directory XML
Search should work now as expected, as well as scrolling through next page results.