app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthScreen.kt

@@ -239,6 +239,19 @@ fun MonthScreen(
             .collect { (first, last) -> viewModel.onVisibleMonthsChanged(first, last) }
     }
 
+    // Keep the paged month tracking the scrolling grid. The scrolling styles
+    // navigate by scroll position and never touch the paged month otherwise, so
+    // without this it stays wherever paged navigation last left it (today's
+    // month, on a fresh open) — and switching to a paged style, or reseeding the
+    // other scrolling style's list state, which both read off it, would snap
+    // back there rather than staying on the month you were looking at.
+    LaunchedEffect(listState, scrolling, dense, weekStart) {
+        if (!scrolling) return@LaunchedEffect
+        snapshotFlow { visibleMonth }
+            .distinctUntilChanged()
+            .collect { viewModel.syncScrollMonth(it) }
+    }
+
     val isOnCurrentMonth = titleMonth == YearMonth(today.year, today.month)
 
     // Continuous names the month on the block's own sticky header, so the bar

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthViewModel.kt

@@ -284,6 +284,21 @@ class MonthViewModel @Inject constructor(
         _selectedDate.value = todayDate
     }
 
+    /**
+     * Track [_month] to the month a scrolling style is showing. Those styles
+     * navigate by scroll position and never set [_month] themselves, so it would
+     * otherwise sit wherever paged navigation last left it (today's month, on a
+     * fresh open) — and a switch to a paged style, or a reseed of the other
+     * scrolling style's list, would jump there instead of holding position. The
+     * selection is realigned alongside it so that landing on the Split style
+     * shows a live day in the month on screen rather than a stale, off-month one.
+     */
+    fun syncScrollMonth(ym: YearMonth) {
+        if (_month.value == ym) return
+        _month.value = ym
+        _selectedDate.value = selectionForMonth(ym, todayDate)
+    }
+
     /** Jump to the month containing [date] (drawer jump-to-date). */
     fun goToDate(date: LocalDate) {
         _month.value = YearMonth(date.year, date.month)