OpenText Engineering addressed a customer performance use case where large thumbnail counts were impacting the first page render performance.  In doing so they limited maximum thumbnails to be rendered to 30.  This is not ideal for most customers so feel free to increase this maximum limit to a value that is more practical for your customers.

File:  C:\inetpub\wwwroot\AppXtender\App\Controllers\thumbnail.js

Line 9:  MAX_THUMBNAIL_PAGE_COUNT = 30;

After making this change, users have to close their browsers and clear their browser cache for the changes to take effect