Hi Microsoft and All,
Observation: After looking and tinkering with some of the settings, I find (that for me anyway) If I go to "Settings">Accounts>Sign-In Options> then scroll to the bottom of the screen, and turn "**OFF"**this switch

And then "Reboot" my system, Windows will only ask for my
Password Once and boot into Win 10 Fall Creators as
normal.
after this trial I returned the switch to the "On" position and the problem Returned. I will leave it "On" until Microsoft can Confirm the problem or Fix it correctly. Has anyone else experienced this?...
I do NOT
submit this as a FIX, or Suggest, that anyone try this suggestion. I Posted this here in Hopes that a Microsoft engineer will see it, and hopefully be able to point them into the right direction for a permanent Patch release in the next update. Ifanyone try's this, you do so, at your own Risk.
I am a voluntary Microsoft Community Member like yourselves, and do Not work for Microsoft.
Thank-You
Edit: 10/21/17 2:08pm After doing a Google search on this problem, I find that I'm
Not the only one that has stumbled onto this. Someone on October 13th 2017 which is posted before me, had almost this same information posted on "Reddit.com"labeled "Windows 10 Fall Creators Double login". "Just sending Credit to Where It belongs, after ALL it appears to me that they discovered it first":)
Good Luck and Best Regards...
If any of my Reply's to you where Helpful or Your Answer, Please mark as so, Thank-You