diff --git a/ProblemMap/GlobalFixMap/Eval_Observability/variance_and_drift.md b/ProblemMap/GlobalFixMap/Eval_Observability/variance_and_drift.md
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 # Eval Observability — Variance and Drift
 
+<details>
+  <summary><strong>🧭 Quick Return to Map</strong></summary>
+
+<br>
+
+  > You are in a sub-page of **Eval_Observability**.  
+  > To reorient, go back here:  
+  >
+  > - [**Eval_Observability** — evaluation metrics and system observability](./README.md)  
+  > - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)  
+  > - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)  
+  >
+  > Think of this page as a desk within a ward.  
+  > If you need the full triage and all prescriptions, return to the Emergency Room lobby.
+</details>
+
+
 Variance and drift checks detect when evaluation scores are **unstable across runs** or when **semantic meaning slowly shifts** without clear boundary failures.  
 These probes prevent "false confidence" in benchmarks by catching hidden instability.