diff --git a/main.go b/main.go
index 66a9e93..8cfc4d4 100644
--- a/main.go
+++ b/main.go
@@ -5527,27 +5527,67 @@ func (u *ui) headerActions(gtx layout.Context) layout.Dimensions {
 	if u.shouldShowDesktopWorkingHeader() {
 		return layout.Dimensions{}
 	}
+	spacing := gtx.Dp(unit.Dp(8))
+	rowOriginX := 0
+	var syncDims, lockDims, mainDims layout.Dimensions
 	row := func(gtx layout.Context) layout.Dimensions {
 		return layout.Flex{Spacing: layout.SpaceStart}.Layout(gtx,
-			layout.Rigid(u.syncButtonGroup),
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				syncDims = u.syncButtonGroup(gtx)
+				return syncDims
+			}),
 			layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
 			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
 				btn := material.Button(u.theme, &u.lockVault, "Lock")
-				return btn.Layout(gtx)
+				lockDims = btn.Layout(gtx)
+				return lockDims
 			}),
 			layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
-			layout.Rigid(u.mainMenuButtonGroup),
-		)
-	}
-	if u.mode == "phone" {
-		return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
-			layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
-				return layout.Dimensions{Size: gtx.Constraints.Min}
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				mainDims = u.mainMenuButtonGroup(gtx)
+				return mainDims
 			}),
-			layout.Rigid(row),
 		)
 	}
-	return row(gtx)
+
+	rowOps := op.Record(gtx.Ops)
+	rowDims := row(gtx)
+	rowCall := rowOps.Stop()
+
+	if u.mode == "phone" {
+		rowOriginX = max(0, gtx.Constraints.Max.X-rowDims.Size.X)
+	}
+
+	drawMenu := func(menu layout.Widget, triggerRightX, triggerBottomY int) {
+		menuGTX := gtx
+		menuGTX.Constraints.Min = image.Point{}
+		menuGTX.Constraints.Max.X = gtx.Constraints.Max.X
+		menuOps := op.Record(gtx.Ops)
+		menuDims := layout.Inset{Top: unit.Dp(6)}.Layout(menuGTX, menu)
+		menuCall := menuOps.Stop()
+		menuX := anchoredMenuOriginX(gtx.Constraints.Max.X, rowOriginX, triggerRightX, menuDims.Size.X)
+		stack := op.Offset(image.Pt(menuX, triggerBottomY)).Push(gtx.Ops)
+		menuCall.Add(gtx.Ops)
+		stack.Pop()
+	}
+
+	rowStack := op.Offset(image.Pt(rowOriginX, 0)).Push(gtx.Ops)
+	rowCall.Add(gtx.Ops)
+	rowStack.Pop()
+
+	if u.syncMenuOpen {
+		drawMenu(u.syncMenu, syncDims.Size.X, rowDims.Size.Y)
+	}
+	if u.mainMenuOpen {
+		triggerRightX := syncDims.Size.X + spacing + lockDims.Size.X + spacing + mainDims.Size.X
+		drawMenu(u.mainMenu, triggerRightX, rowDims.Size.Y)
+	}
+
+	width := rowDims.Size.X
+	if u.mode == "phone" {
+		width = gtx.Constraints.Max.X
+	}
+	return layout.Dimensions{Size: image.Pt(width, rowDims.Size.Y)}
 }
 
 func (u *ui) mainMenu(gtx layout.Context) layout.Dimensions {
@@ -5670,22 +5710,7 @@ func (u *ui) syncButtonGroup(gtx layout.Context) layout.Dimensions {
 			}),
 		)
 	}
-	rowDims := row(gtx)
-	if !u.syncMenuOpen {
-		return rowDims
-	}
-
-	menuGTX := gtx
-	menuGTX.Constraints.Min = image.Point{}
-	menuOps := op.Record(gtx.Ops)
-	menuDims := layout.Inset{Top: unit.Dp(6)}.Layout(menuGTX, u.syncMenu)
-	menuCall := menuOps.Stop()
-
-	menuX := anchoredMenuX(rowDims.Size.X, menuDims.Size.X)
-	stack := op.Offset(image.Pt(menuX, rowDims.Size.Y)).Push(gtx.Ops)
-	menuCall.Add(gtx.Ops)
-	stack.Pop()
-	return rowDims
+	return row(gtx)
 }
 
 func (u *ui) syncMenuToggle(gtx layout.Context) layout.Dimensions {
@@ -7233,23 +7258,7 @@ func (u *ui) mainMenuButtonGroup(gtx layout.Context) layout.Dimensions {
 		btn.Inset = layout.UniformInset(unit.Dp(8))
 		return btn.Layout(gtx)
 	}
-
-	buttonDims := button(gtx)
-	if !u.mainMenuOpen {
-		return buttonDims
-	}
-
-	menuGTX := gtx
-	menuGTX.Constraints.Min = image.Point{}
-	menuOps := op.Record(gtx.Ops)
-	menuDims := layout.Inset{Top: unit.Dp(6)}.Layout(menuGTX, u.mainMenu)
-	menuCall := menuOps.Stop()
-
-	menuX := anchoredMenuX(buttonDims.Size.X, menuDims.Size.X)
-	stack := op.Offset(image.Pt(menuX, buttonDims.Size.Y)).Push(gtx.Ops)
-	menuCall.Add(gtx.Ops)
-	stack.Pop()
-	return buttonDims
+	return button(gtx)
 }
 
 func (u *ui) syncMenuDropsBelowTrigger() bool {
@@ -7272,6 +7281,17 @@ func anchoredMenuX(triggerWidth, menuWidth int) int {
 	return triggerWidth - menuWidth
 }
 
+func anchoredMenuOriginX(containerWidth, rowOriginX, triggerRightX, menuWidth int) int {
+	x := rowOriginX + triggerRightX - menuWidth
+	if x < 0 {
+		return 0
+	}
+	if x+menuWidth > containerWidth {
+		return max(0, containerWidth-menuWidth)
+	}
+	return x
+}
+
 func detailLine(th *material.Theme, label, value string) layout.Widget {
 	return func(gtx layout.Context) layout.Dimensions {
 		valueSize := unit.Sp(16)
diff --git a/main_test.go b/main_test.go
index 6678494..72ae6e3 100644
--- a/main_test.go
+++ b/main_test.go
@@ -367,6 +367,17 @@ func TestAnchoredMenuXAllowsWiderMenusToExtendLeft(t *testing.T) {
 	}
 }
 
+func TestAnchoredMenuOriginXClampsToVisibleContainer(t *testing.T) {
+	t.Parallel()
+
+	if got := anchoredMenuOriginX(360, 312, 360, 140); got != 220 {
+		t.Fatalf("anchoredMenuOriginX should keep a right-aligned menu visible, got %d want 220", got)
+	}
+	if got := anchoredMenuOriginX(360, 0, 44, 160); got != 0 {
+		t.Fatalf("anchoredMenuOriginX should clamp oversized left overflow to zero, got %d want 0", got)
+	}
+}
+
 func TestUICurrentVaultSummary(t *testing.T) {
 	t.Parallel()