eFileCabinet version 5.0 and later defaults to show 1000 Drawers.
To change it, go to:
1. Administration Tab > Server Settings
2. Advanced Tab > "Limit Drawers and Search results to:"
Change the number in increments of 2500 until you surpass your current drawer count; this will give you a little buffer for future growth. Keep in mind that making this number higher than you need will slow down system performance and response time.