diff --git a/ui/dr-ui/ui/app.slint b/ui/dr-ui/ui/app.slint
index 7e29151..2fd86ec 100644
--- a/ui/dr-ui/ui/app.slint
+++ b/ui/dr-ui/ui/app.slint
@@ -18,6 +18,9 @@ component StatusBar inherits Rectangle {
     in property <string> backend;
     in property <string> layout-class;
     in property <int> fps;
+    /// FR-UI-1: the layout class, so the instrumentation can stand down on a
+    /// strip too narrow to carry both it and the controls.
+    in property <bool> expanded: true;
     in property <string> filename;
     in property <string> position;
     /// Only offered where there is a library to go back to — with files named
@@ -78,19 +81,70 @@ component StatusBar inherits Rectangle {
             clicked => { root.back-to-library(); }
         }
 
-        // The backend is an identifying label, not a state — it says which
-        // path is in use, and it says the same thing whether that path is
-        // fast or slow. The accent it used to carry made every frame look
-        // like an alert; `fps` below is the thing here that can go wrong.
-        Label { text: root.backend; }
-
         Value { text: root.filename; compact: true; overflow: elide; }
 
         Caption { text: root.position; }
 
         Rectangle { horizontal-stretch: 1; }
 
-        Caption { text: root.layout-class; }
+        // --- instrumentation, and only where there is room for it ---------
+        //
+        // The render backend, the layout class and the frame rate are all
+        // developer readouts. They cost about 200 logical pixels of a strip
+        // that also carries the only way out of develop, the undo pair, the
+        // panel toggle and the export button — and a `HorizontalLayout` given
+        // less width than its children's minimums does not shrink them, it
+        // runs off the end.
+        //
+        // A tablet in portrait is 768 logical pixels, so that is exactly what
+        // happened: everything from the panel toggle rightwards was pushed off
+        // the right-hand edge. The develop column is *also* closed by default
+        // below the breakpoint, so the toggle being unreachable meant the
+        // column could not be opened at all — and with it went copy and paste,
+        // which live in it. Reported as "I have no idea how to copy a setting
+        // on Android and apply it to other images", and the answer was that
+        // there was no way to.
+        //
+        // Collapsed to zero width rather than wrapped in an `if`: this strip
+        // is inside the layout that `expanded` feeds, and a conditional child
+        // here is the shape that has already caused binding loops in this file
+        // (see the panel below). A `visible: false` child still takes its slot
+        // in a layout, so the width has to go as well.
+        Rectangle {
+            width: root.expanded ? diagnostics.preferred-width : 0px;
+            visible: root.expanded;
+            clip: true;
+
+            diagnostics := HorizontalLayout {
+                spacing: Theme.gap;
+
+                // The backend is an identifying label, not a state — it says
+                // which path is in use, and it says the same thing whether
+                // that path is fast or slow. The accent it used to carry made
+                // every frame look like an alert; `fps` below is the thing
+                // here that can go wrong.
+                Label {
+                    text: root.backend;
+                    vertical-alignment: center;
+                }
+
+                Caption {
+                    text: root.layout-class;
+                    vertical-alignment: center;
+                }
+
+                // Degraded performance, so this is a caution rather than an
+                // active state: the frame rate has fallen below what the
+                // compositing path is supposed to sustain, which is exactly
+                // the assumption A1 exists to test. `warn` is the one hue left
+                // in the palette and this earns it.
+                Caption {
+                    text: root.fps + " fps";
+                    warn: root.fps < 55;
+                    vertical-alignment: center;
+                }
+            }
+        }
 
         // Undo and redo, in the strip rather than in the develop column: the
         // panel can be put away, and the one control that takes back a
@@ -149,14 +203,6 @@ component StatusBar inherits Rectangle {
             clicked => { root.open-settings(); }
         }
 
-        // Degraded performance, so this is a caution rather than an active
-        // state: the frame rate has fallen below what the compositing path is
-        // supposed to sustain, which is exactly the assumption A1 exists to
-        // test. `warn` is the one hue left in the palette and this earns it.
-        Caption {
-            text: root.fps + " fps";
-            warn: root.fps < 55;
-        }
     }
 
     Rectangle {
@@ -1145,6 +1191,7 @@ in property <bool> panel-visible: true;
                 backend: root.backend;
                 layout-class: root.layout-class;
                 fps: root.fps;
+                expanded: root.expanded;
                 filename: root.filename;
                 position: root.total > 0 ? root.index + 1 + " / " + root.total : "";
                 // Only where a library was opened; command-line files have no