diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SettingsUI/VwrSettingsPaneDevZone.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SettingsUI/VwrSettingsPaneDevZone.swift
index 7b92f29d..7f5759ce 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SettingsUI/VwrSettingsPaneDevZone.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SettingsUI/VwrSettingsPaneDevZone.swift
@@ -26,6 +26,12 @@ public struct VwrSettingsPaneDevZone: View {
   )
   private var securityHardenedCompositionBuffer: Bool
 
+  @AppStorage(
+    wrappedValue: true,
+    UserDef.kCheckAbusersOfSecureEventInputAPI.rawValue
+  )
+  private var checkAbusersOfSecureEventInputAPI: Bool
+
   // MARK: - Main View
 
   public var body: some View {
@@ -54,6 +60,16 @@ public struct VwrSettingsPaneDevZone: View {
             )
             .settingsDescription()
           }
+          VStack(alignment: .leading) {
+            Toggle(
+              (UserDef.kCheckAbusersOfSecureEventInputAPI.metaData?.shortTitle ?? "i18n:UserDef.kCheckAbusersOfSecureEventInputAPI.shortTitle").localized,
+              isOn: $checkAbusersOfSecureEventInputAPI
+            )
+            Text(
+              (UserDef.kCheckAbusersOfSecureEventInputAPI.metaData?.description ?? "i18n:UserDef.kCheckAbusersOfSecureEventInputAPI.description").localized
+            )
+            .settingsDescription()
+          }
         }
       }.formStyled().frame(minWidth: CtlSettingsUI.formWidth, maxWidth: ceil(CtlSettingsUI.formWidth * 1.2))
     }