diff --git a/packages/dashboard/app/components/WorkflowNodeEditor.css b/packages/dashboard/app/components/WorkflowNodeEditor.css
index a85274c4c8..f12794bba8 100644
--- a/packages/dashboard/app/components/WorkflowNodeEditor.css
+++ b/packages/dashboard/app/components/WorkflowNodeEditor.css
@@ -1334,6 +1334,7 @@
     width: 100%;
     min-width: 0;
     max-width: 100%;
+    height: 100%;
   }
 
   .wf-editor-list-item,
diff --git a/packages/dashboard/app/components/__tests__/WorkflowNodeEditor.css.test.ts b/packages/dashboard/app/components/__tests__/WorkflowNodeEditor.css.test.ts
index 790ccda070..d3bc9991bf 100644
--- a/packages/dashboard/app/components/__tests__/WorkflowNodeEditor.css.test.ts
+++ b/packages/dashboard/app/components/__tests__/WorkflowNodeEditor.css.test.ts
@@ -148,6 +148,7 @@ describe("WorkflowNodeEditor mobile CSS contract", () => {
     expect(reactFlowSurfaceRule).toMatch(/width\s*:\s*100%\s*;/);
     expect(reactFlowSurfaceRule).toMatch(/min-width\s*:\s*0\s*;/);
     expect(reactFlowSurfaceRule).toMatch(/max-width\s*:\s*100%\s*;/);
+    expect(reactFlowSurfaceRule).toMatch(/height\s*:\s*100%\s*;/);
   });
 
   it("FN-6034 preserves mobile staged editor visibility and inspector stacking", () => {
@@ -241,7 +242,10 @@ describe("WorkflowNodeEditor mobile CSS contract", () => {
     const selectorRule = findRule(selectorMobile, /\.workflow-selector\s*\{[^}]*\}/);
     expect(selectorRule).toMatch(/flex-direction\s*:\s*column\s*;/);
 
-    const manageRule = findRule(selectorMobile, /\.workflow-selector select,\s*\.workflow-selector-manage\s*\{[^}]*\}/);
+    const manageRule = findRule(
+      selectorMobile,
+      /\.workflow-selector select,\s*\.workflow-selector-manage,\s*\.workflow-selector-collapsed-button\s*\{[^}]*\}/,
+    );
     expect(manageRule).toMatch(/width\s*:\s*100%\s*;/);
   });
 });