The default number of members that is displayed in the preview is 1000.
To change the maximum number of members displayed in Member Selection Preview:
In Registry Editor window, select HKEY_CURRENT_USER and navigate to Software/Essbase/QueryDesigner/Preview.
While in Software/Essbase/QueryDesigner/Preview , select Edit, then New, and then DWORD Value.
Specify a name for this registry; for example, enter MaximumMembers.
Double-click the registry entry, and in Edit DWORD Value, specify a value.
In Value data, specify the maximum number of preview members to display.