Only hooked up the section state had forgot to plugin into Header's isEvaluationEnabled

src/components/ExamEditor/Exercises/Blanks/index.tsx

@@ -38,7 +38,7 @@ interface Props {
     onDiscard: () => void;
     onDelete: () => void;
     onPractice: () => void;
-    isEvaluationEnabled: boolean;
+    isEvaluationEnabled?: boolean;
     children: ReactNode;
 }