diff --git a/openhands/app_server/web_client/default_web_client_config_injector.py b/openhands/app_server/web_client/default_web_client_config_injector.py
index 81f2c69427..43657d16ea 100644
--- a/openhands/app_server/web_client/default_web_client_config_injector.py
+++ b/openhands/app_server/web_client/default_web_client_config_injector.py
@@ -160,12 +160,15 @@ def _get_feature_flags() -> WebClientFeatureFlags:
 
     Reads ENABLE_BILLING, HIDE_LLM_SETTINGS, ENABLE_JIRA, ENABLE_JIRA_DC,
     ENABLE_LINEAR, HIDE_USERS_PAGE, HIDE_BILLING_PAGE, HIDE_INTEGRATIONS_PAGE,
-    HIDE_PERSONAL_WORKSPACES, ENABLE_ACP, and OH_ENABLE_ONBOARDING from
-    environment. Each flag is True only if the corresponding env var is
-    exactly 'true', otherwise False.
+    HIDE_PERSONAL_WORKSPACES, and OH_ENABLE_ONBOARDING from environment. Each
+    flag is True only if the corresponding env var is exactly 'true', otherwise
+    False.
 
-    OH_ALLOW_USER_LLM_CONFIGURATION is the exception: it defaults to 'true'
-    when unset so SaaS and existing installs keep the BYOK editing UI.
+    OH_ALLOW_USER_LLM_CONFIGURATION and ENABLE_ACP are the exceptions: they
+    default to 'true' when unset. OH_ALLOW_USER_LLM_CONFIGURATION keeps the
+    BYOK editing UI visible; ENABLE_ACP keeps the ACP agent configuration UI
+    (Settings > Agent) visible on SaaS and existing installs, matching Agent
+    Canvas. Set ENABLE_ACP=false to hide it.
     """
     return WebClientFeatureFlags(
         enable_billing=os.getenv('ENABLE_BILLING', 'false') == 'true',
@@ -182,7 +185,7 @@ def _get_feature_flags() -> WebClientFeatureFlags:
             'OH_ALLOW_USER_LLM_CONFIGURATION', 'true'
         )
         == 'true',
-        enable_acp=os.getenv('ENABLE_ACP', 'false') == 'true',
+        enable_acp=os.getenv('ENABLE_ACP', 'true') == 'true',
         enable_onboarding=os.getenv('OH_ENABLE_ONBOARDING', 'false') == 'true',
         enable_automations=os.getenv('ENABLE_AUTOMATIONS', 'true') == 'true',
     )
diff --git a/openhands/app_server/web_client/web_client_models.py b/openhands/app_server/web_client/web_client_models.py
index 8c73b1e802..9764dadeda 100644
--- a/openhands/app_server/web_client/web_client_models.py
+++ b/openhands/app_server/web_client/web_client_models.py
@@ -33,7 +33,10 @@ class WebClientFeatureFlags(BaseModel):
     # existing installs are unaffected. UI-level only — previously saved BYOK
     # settings keep working at runtime.
     allow_user_llm_configuration: bool = True
-    enable_acp: bool = False
+    # Defaults to True so the ACP agent configuration UI (Settings > Agent) is
+    # visible on SaaS and existing installs, matching Agent Canvas. Set
+    # ENABLE_ACP=false to hide it. UI-level only.
+    enable_acp: bool = True
     deployment_mode: DeploymentMode | None = None
     enable_onboarding: bool = False
     enable_automations: bool = True
diff --git a/tests/unit/app_server/test_default_web_client_config_injector.py b/tests/unit/app_server/test_default_web_client_config_injector.py
index f44be40135..7c101d6dc3 100644
--- a/tests/unit/app_server/test_default_web_client_config_injector.py
+++ b/tests/unit/app_server/test_default_web_client_config_injector.py
@@ -303,6 +303,41 @@ class TestGetFeatureFlags:
             result = _get_feature_flags()
             assert result.enable_automations is True
 
+    def test_enable_acp_true_by_default(self):
+        """When ENABLE_ACP is unset, enable_acp defaults to True.
+
+        Keeps the ACP agent configuration UI (Settings > Agent) visible on
+        SaaS and existing installs, matching Agent Canvas.
+        """
+        from openhands.app_server.web_client.default_web_client_config_injector import (
+            _get_feature_flags,
+        )
+
+        with patch.dict(os.environ, {}, clear=True):
+            os.environ.pop('ENABLE_ACP', None)
+            result = _get_feature_flags()
+            assert result.enable_acp is True
+
+    def test_enable_acp_false_when_env_var_false(self):
+        """When ENABLE_ACP is 'false', enable_acp flag is False."""
+        from openhands.app_server.web_client.default_web_client_config_injector import (
+            _get_feature_flags,
+        )
+
+        with patch.dict(os.environ, {'ENABLE_ACP': 'false'}):
+            result = _get_feature_flags()
+            assert result.enable_acp is False
+
+    def test_enable_acp_true_when_env_var_true(self):
+        """When ENABLE_ACP is 'true', enable_acp flag is True."""
+        from openhands.app_server.web_client.default_web_client_config_injector import (
+            _get_feature_flags,
+        )
+
+        with patch.dict(os.environ, {'ENABLE_ACP': 'true'}):
+            result = _get_feature_flags()
+            assert result.enable_acp is True
+
 
 class TestGetJiraDcServiceAccountConfig:
     """Test cases for Jira DC service-account web-client config helpers."""