diff --git a/gateway/display_config.py b/gateway/display_config.py
index 181ce3dbbc0..e352ea0e9d6 100644
--- a/gateway/display_config.py
+++ b/gateway/display_config.py
@@ -239,6 +239,10 @@ def _normalise(setting: str, value: Any) -> Any:
         if value is True:
             return "all"
         val = str(value).strip().lower()
+        if val in {"false", "0", "no"}:
+            return "off"
+        if val in {"true", "1", "yes", "on"}:
+            return "all"
         return val if val in {"off", "new", "all", "verbose", "log"} else "all"
     if setting in {
         "show_reasoning",
@@ -246,6 +250,7 @@ def _normalise(setting: str, value: Any) -> Any:
         "interim_assistant_messages",
         "long_running_notifications",
         "busy_ack_detail",
+        "busy_steer_ack_enabled",
         "thinking_progress",
     }:
         if isinstance(value, str):
diff --git a/tests/gateway/test_display_config.py b/tests/gateway/test_display_config.py
index 4f2848eacdd..d05807e41a7 100644
--- a/tests/gateway/test_display_config.py
+++ b/tests/gateway/test_display_config.py
@@ -54,6 +54,22 @@ class TestResolveDisplaySetting:
         # Unknown platform, no config → global default "all"
         assert resolve_display_setting(config, "unknown_platform", "tool_progress") == "all"
 
+    def test_tool_progress_boolean_like_strings_normalise(self):
+        """Quoted YAML booleans should not unexpectedly enable progress."""
+        from gateway.display_config import resolve_display_setting
+
+        assert resolve_display_setting({"display": {"tool_progress": "false"}}, "telegram", "tool_progress") == "off"
+        assert resolve_display_setting({"display": {"tool_progress": "0"}}, "telegram", "tool_progress") == "off"
+        assert resolve_display_setting({"display": {"tool_progress": "no"}}, "telegram", "tool_progress") == "off"
+        assert resolve_display_setting({"display": {"tool_progress": "true"}}, "telegram", "tool_progress") == "all"
+
+    def test_busy_steer_ack_enabled_string_false_normalises(self):
+        from gateway.display_config import resolve_display_setting
+
+        config = {"display": {"platforms": {"telegram": {"busy_steer_ack_enabled": "false"}}}}
+
+        assert resolve_display_setting(config, "telegram", "busy_steer_ack_enabled", True) is False
+
     def test_fallback_parameter_used_last(self):
         """Explicit fallback is used when nothing else matches."""
         from gateway.display_config import resolve_display_setting