There are similar posts, but those are for different laptop. I am using Dell Inspiron N5010. I couldn't find how to invert fn keys either from BIOS or from Windows Mobility Center.
How to invert function keys on Dell N5010?
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I found the solution for reversing the Fn keys on Dell N5010 from the User manual. It can be done either from the Bios or from the Windows Mobility Center program - I used the latter: Press Windows key + "X". When it opens the Win Mob Center, in the Function key row, choose 'Function key' as the Fn Key behaviour. Voila - it's back to business.
are you sure you did not miss it?
See page 36 of this document
All your Docs for that Model