Legal review UI "Conversation" is too large to display.
By default "Conversation" set to 100 conversations.
Open \Program Files (x86)\ZyLAB\EDiscovery\LegalReview\Review_web\HtmlApp\app-config.json in notepad
Look for "emailThreadItemsDisplayLimit": 100,
Change to a larger value, note this may significantly slow down the performance of viewing these larger conversations.
After that restart the legalreview standalone services and reload the page with ctrl+f5.