[Zubersoft]

Turns out they added a "IsHeaderItemsCarouselEnabled" flag to the pivot control (the standard control in UWP apps for handling tabs). I just switched that off, and now the behavior matches Android.

Thanks,
Mike

EDIT:
It still doesn't work well in terms of scrolling the tabs. I'm going to completely replace the pivot control with my own custom control that looks the same but behaves better.