Re: Ahh makes sense now
Had just the same, both settings and wireless hotspot tiles vanished. Both easily put back though, but seems an oddity.
Liking the new flexibility with the notification shade though. I used to have 5 or 6 that I wanted there and all the rest I can do without, so now being able to turn some off and fully rearrange the others it's working very nicely.
Have to say that Win10 does seem to eat battery faster than Win8.1 used to. That said my Lumia 640LTE will still go 2-3 days at least before needing more juice, so it's not a desperate issue.