KvadrantPivot
The control the rest of this library exists to make possible.
A page title in the flow of the content rather than a bar above it, oversized headers that scroll at their own rate while the pages scroll at theirs, and the next header showing at the right edge so you can see there is more. Every number is Microsoft's: the header is PivotHeaderFontSize = 72 px SemiLight, its padding is 21,0,1,0 — that 21 px is the gap between headers — an unselected header sits at PhonePivotUnselectedItemOpacity = 0.4, and selection is instant, Duration="0", with no crossfade.
The peek is not a number. The original lays its headers on a Canvas at absolute positions, so how far the next one shows falls out of where the strip is scrolled to — which is what KvadrantPivotHeaders reproduces. Nothing here is tuned to make it look right.
Pages are cyclical, as Microsoft's guidance says: past the last one the next is the first, and the header strip wraps with them. That is why rememberKvadrantPivotState exists — the pager runs on a very large virtual page count and the page index is taken modulo the number of titles.