diff --git a/src/govoplan_access/backend/api/v1/auth.py b/src/govoplan_access/backend/api/v1/auth.py
index 6cc1ead..7708d03 100644
--- a/src/govoplan_access/backend/api/v1/auth.py
+++ b/src/govoplan_access/backend/api/v1/auth.py
@@ -991,6 +991,14 @@ def update_profile(
         if payload.ui_preferences is None:
             next_settings["ui"] = UserUiPreferences().model_dump()
         else:
+            if (
+                payload.ui_preferences.navigation is not None
+                and payload.ui_preferences.navigation.locked
+            ):
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="Personal navigation preferences cannot lock entries.",
+                )
             next_ui = _user_ui_preferences(next_settings).model_dump()
             next_ui.update(payload.ui_preferences.model_dump(exclude_unset=True))
             next_settings["ui"] = UserUiPreferences.model_validate(next_ui).model_dump()
diff --git a/src/govoplan_access/backend/manifest.py b/src/govoplan_access/backend/manifest.py
index 84a0493..306e5c2 100644
--- a/src/govoplan_access/backend/manifest.py
+++ b/src/govoplan_access/backend/manifest.py
@@ -639,6 +639,27 @@ ACCESS_DOCUMENTATION: tuple[DocumentationTopic, ...] = (
             "verification": "The administration table shows the expected active credential count, last-use timestamp, revision, and audit events without exposing secret material.",
         },
     ),
+    DocumentationTopic(
+        id="access.reference.personal-navigation",
+        title="Personalize the side rail",
+        summary="Users can reorder or hide available navigation entries without changing access or other users' workspaces.",
+        body=(
+            "Open Settings and use the workspace navigation editor to move or show available entries. Personal order and visibility take precedence over tenant and system preferences. Entries locked by a system or tenant administrator remain visible, and a user cannot create a lock. Choosing the inherited order removes the personal layer. Module entitlement, View policy, and permissions continue to decide which destinations are available, so changing navigation never grants access."
+        ),
+        layer="configured",
+        documentation_types=("user", "admin"),
+        audience=("user", "tenant_admin", "system_admin"),
+        order=85,
+        related_modules=("admin", "tenancy", "views"),
+        links=(
+            DocumentationLink(label="Workspace settings", href="/settings?section=workspace", kind="runtime"),
+        ),
+        metadata={
+            "kind": "reference",
+            "help_contexts": ["core.settings.workspace"],
+            "outcome": "The user's side rail reflects the personal preference while locked and inaccessible entries remain governed by higher-level policy.",
+        },
+    ),
     DocumentationTopic(
         id="access.workflow.manage-sessions",
         title="Review and revoke account sessions",