daisy chain monitors

Hi Guys,

I'm running a Mac Mini (mid 2010) with macOS Sierra. I've two monitors, the first a Dell U2415 which is connected via DP to the Mini; the second is a Dell U2412M which I've connected to the U2415. Both screens show the same display which is a waste of time. Is there any way that the Mac will allow them to be treated as two separate displays for content?

Thanks,