diff --git a/app/qml/Main.qml b/app/qml/Main.qml
index 0fe8f60..2f8dc9a 100644
--- a/app/qml/Main.qml
+++ b/app/qml/Main.qml
@@ -201,18 +201,25 @@ ApplicationWindow {
     }
 
     // ---- the shell -------------------------------------------------------
-    header: ToolBar {
+    /* A plain Rectangle, not a ToolBar. A Controls ToolBar hands its children
+     * to a style-owned contentItem, and on this phone that item sat 35 px below
+     * the bar itself -- header y 0 h 42 with its gear at y 56 -- so the gear
+     * was drawn, and clicked, outside the header, over the sidebar. A
+     * Rectangle puts its children where it is (checked with --uitest on the
+     * device and on both styles at home). */
+    header: Rectangle {
         id: appBar
+        objectName: "appBar"
         implicitHeight: Theme.headerHeight
-        background: Rectangle {
-            color: Theme.surface
-            Rectangle {
-                anchors.bottom: parent.bottom
-                width: parent.width
-                height: 1
-                color: Theme.border
-            }
+        color: Theme.surface
+
+        Rectangle {
+            anchors.bottom: parent.bottom
+            width: parent.width
+            height: 1
+            color: Theme.border
         }
+
         RowLayout {
             anchors.fill: parent
             anchors.leftMargin: Theme.pad
diff --git a/app/src/ui/UiTest.cpp b/app/src/ui/UiTest.cpp
index cd78d64..1b37ca1 100644
--- a/app/src/ui/UiTest.cpp
+++ b/app/src/ui/UiTest.cpp
@@ -20,6 +20,7 @@
 #include <QPainter>
 #include <QPointingDevice>
 #include <QQuickItem>
+#include <QQuickStyle>
 #include <QQmlApplicationEngine>
 #include <QQmlContext>
 #include <QQuickWindow>
@@ -86,6 +87,19 @@ void check(bool ok, const QString &what) {
     g_fail++;
 }
 
+/* A line in the run's log that is not a check: what the window looked like at
+ * a step, for the cases where "it did nothing" is all the checks can say. */
+void note(const QString &what) {
+  std::printf("note %s\n", qPrintable(what));
+  std::fflush(stdout);
+  if (g_runLog.isOpen()) {
+    g_runLog.write("note ");
+    g_runLog.write(what.toUtf8());
+    g_runLog.write("\n");
+    g_runLog.flush();
+  }
+}
+
 /* Every item with this objectName in the visual tree. A view that has just
  * been replayed can still hold the delegates it is about to drop, so a name
  * can match more than one item for a moment. */
@@ -665,6 +679,29 @@ int runUiTest(AgentCore &core, const QString &size) {
   clickMouse(win, QStringLiteral("settingsButton"));
   QQuickItem *panel = item(win, QStringLiteral("settingsPanel"));
   check(panel && panel->isVisible(), QStringLiteral("the gear opens the settings dialog"));
+  /* Where the pieces actually are, whether or not that worked: a click goes to
+   * whatever is on top at that point, and a style lays a header out its own
+   * way -- the phone runs a different style from a desktop (Universal against
+   * Basic), which is where the header's content ended up 35 px below the
+   * header itself. */
+  {
+    QQuickItem *bar = item(win, QStringLiteral("appBar"));
+    const QMargins safe = win->property("safeAreaMargins").value<QMargins>();
+    note(QStringLiteral("style %1, window %2x%3, header y %4 h %5, "
+                        "gear centre y %6, safe area %7/%8/%9/%10")
+             .arg(QQuickStyle::name())
+             .arg(win->width())
+             .arg(win->height())
+             .arg(bar ? bar->y() : -1)
+             .arg(bar ? bar->height() : -1)
+             .arg(item(win, QStringLiteral("settingsButton"))
+                      ? centre(item(win, QStringLiteral("settingsButton"))).y()
+                      : -1)
+             .arg(safe.left())
+             .arg(safe.top())
+             .arg(safe.right())
+             .arg(safe.bottom()));
+  }
   /* item() answers with an item that exists even when nothing is visible (the
    * QObject-tree fallback), so "the dialog is not open" is the invisible case
    * too. */