NEF on primary, JPEG on secondary.

I am trying to save my NEF files on my primary slot and to backup them in JPEG format on the secondary slot.
For some reason, the camera keeps both formats on both slots.
I had no problem with my D7200.
Any help?
Thanks,
Amnon

Sorry, Found my answer.
Thanks

I should just be a simple menu setup. It is that way in my D750

I know, I have just missed the line on the menu.