diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/PrefMgr_Core.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/PrefMgr_Core.swift
index 9f9d9ea2..c18e63a7 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/PrefMgr_Core.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/PrefMgr_Core.swift
@@ -94,6 +94,9 @@ public class PrefMgr: PrefMgrProtocol {
   @AppProperty(key: UserDef.kMoveCursorAfterSelectingCandidate.rawValue, defaultValue: true)
   public var moveCursorAfterSelectingCandidate: Bool
 
+  @AppProperty(key: UserDef.kUseDynamicCandidateWindowOrigin.rawValue, defaultValue: true)
+  public var useDynamicCandidateWindowOrigin: Bool
+
   @AppProperty(key: UserDef.kUseHorizontalCandidateList.rawValue, defaultValue: true)
   public var useHorizontalCandidateList: Bool
 
diff --git a/Packages/vChewing_Shared/Sources/Shared/Protocols/PrefMgrProtocol.swift b/Packages/vChewing_Shared/Sources/Shared/Protocols/PrefMgrProtocol.swift
index 9ace1598..a3d61afe 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Protocols/PrefMgrProtocol.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Protocols/PrefMgrProtocol.swift
@@ -27,6 +27,7 @@ public protocol PrefMgrProtocol {
   var shouldAutoReloadUserDataFiles: Bool { get set }
   var useRearCursorMode: Bool { get set }
   var moveCursorAfterSelectingCandidate: Bool { get set }
+  var useDynamicCandidateWindowOrigin: Bool { get set }
   var useHorizontalCandidateList: Bool { get set }
   var chooseCandidateUsingSpace: Bool { get set }
   var allowBoostingSingleKanjiAsUserPhrase: Bool { get set }
diff --git a/Packages/vChewing_Shared/Sources/Shared/Shared.swift b/Packages/vChewing_Shared/Sources/Shared/Shared.swift
index ae745fd7..91f0c7f6 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Shared.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Shared.swift
@@ -29,6 +29,7 @@ public enum UserDef: String, CaseIterable {
   case kAppleLanguages = "AppleLanguages"
   case kShouldAutoReloadUserDataFiles = "ShouldAutoReloadUserDataFiles"
   case kUseRearCursorMode = "UseRearCursorMode"
+  case kUseDynamicCandidateWindowOrigin = "UseDynamicCandidateWindowOrigin"
   case kUseHorizontalCandidateList = "UseHorizontalCandidateList"
   case kChooseCandidateUsingSpace = "ChooseCandidateUsingSpace"
   case kCassetteEnabled = "CassetteEnabled"