test: establish independent inspection before preferred-view creation

crates/oa-desktop/src/app/architecture_authoring/palette.rs

@@ -123,11 +123,7 @@ impl canvas::Program<Message> for Icon {
                     // rather than a relationship line in allocated-work views.
                     f.stroke(&line(&[(1., 2.), (1., 14.), (15., 14.), (15., 2.)]), stroke);
                     f.stroke(
-                        &Path::rounded_rectangle(
-                            Point::new(5., 9.),
-                            Size::new(6., 3.),
-                            1.into(),
-                        ),
+                        &Path::rounded_rectangle(Point::new(5., 9.), Size::new(6., 3.), 1.into()),
                         stroke,
                     );
                     f.stroke(&line(&[(8., 1.), (8., 7.)]), stroke);

crates/oa-desktop/src/app/canvas_selection_tests.rs

@@ -506,17 +506,16 @@ fn child_creation_navigates_to_a_parent_layer_preferred_view_only_when_needed()
                 ProjectionKind::Overview
             };
         }
+        project.diagrams.get_mut(&f.diagram).unwrap().projection = ProjectionKind::Capabilities;
         f.app = App::with_project(project);
-        f.app.page = Page::Diagram;
-        f.app.layer = Layer::Sa;
-        f.app.active_diagram = Some(f.diagram);
-        f.app.selected = f.diagram;
-        f.app.refresh_draft();
-        let _ = f.app.update(Message::SelectNode(f.placement));
-        let _ = f
-            .app
-            .update(Message::Projection(ProjectionKind::Capabilities));
+        let _ = f.app.update(Message::Select(f.process));
+        let _ = f.app.update(Message::Diagram(Choice {
+            id: f.diagram,
+            label: "System capabilities".into(),
+        }));
         assert_eq!(f.app.selected, f.process);
+        assert_eq!(f.app.layer, Layer::Sa);
+        assert_eq!(f.app.active_diagram, Some(f.diagram));
         let before = f.app.document.snapshot();
         let _ = f
             .app

crates/oa-desktop/src/guide.rs

@@ -322,6 +322,7 @@ fn article(topic: Topic) -> Article {
                             "Show a correspondence between OA and SA",
                             &[
                                 "Choose OA ↔ SA traceability in View content. Changing this setting does not create counterparts or add their placements, so an existing single-layer diagram can initially look unchanged.",
+                                "Switching back to Architecture or another single-layer projection shows only that view's layer. The other layer's placements, routing and saved visibility remain stored; return to OA ↔ SA traceability to show them again, subject to the view's filters. Selecting a displayed card, port or line and opening its Properties keeps the current view and perspective.",
                                 "Use Review layer traces to inspect named Operational and System endpoints and the meaning of their link. This opens the model's layer-trace list with no search restriction; traces between relationships are reviewed here rather than drawn between element cards.",
                                 "In the chosen architecture view, use Add existing elements. The chooser offers compatible elements from both layers. Select an existing endpoint and click its position in the canvas; repeat for the other end if needed. This adds a placement, not a new semantic element or trace. For port correspondences, place the ports' owners.",
                                 "The view shows correspondence lines alongside ordinary relationships. The shown-line count reflects the current projection and visibility settings, not trace coverage. If a line is hidden, use View visibility and inspect Saved view visibility; placing an endpoint does not remove explicit hides or filters.",