Legal Review client only provides first 429 pages of a document when viewing the document in 'Document View'.
In it's default configuration, Legal Review only generates first approximate 429 pages of any document.
To allow more pages to be displayed add the following key to the web.config file usually located in the '\Program Files (x86)\ZyLAB\EDiscovery\LegalReview\Review_web' folder.
<add key="AbortDocumentGenerationAfterPagesCount" value="20000" />
The value represents the number of pages to be generated during viewing.