I would try another web browser, or restarting the iDRAC to see if that helps. You might also try clearing your cookies. Does the account that you're logging in with have system control permissions?
iDRAC version 3.30.30.30. When in iDRAC, I click Configuration > BIOS Settings and am presented an empty page. Did a search on internet, and found some images how the screen should look. How to resolve this? Simon
PowerEdge R7415 iDRAC - BIOS settings page empty