diff --git a/Furious/Qt/QtGui.py b/Furious/Qt/QtGui.py
index e78c5d3..760840e 100644
--- a/Furious/Qt/QtGui.py
+++ b/Furious/Qt/QtGui.py
@@ -23,7 +23,6 @@ from PySide6.QtGui import *
 
 import logging
 import functools
-import darkdetect
 
 logger = logging.getLogger(__name__)
 
@@ -198,7 +197,7 @@ class AppQAction(Mixins.QTranslatable, Mixins.ThemeAware, QAction):
             # Fall back
             super().setIcon(icon)
         else:
-            self.setIconByTheme(darkdetect.theme())
+            self.setIconByTheme(APP().theme())
 
     def themeChangedCallback(self, theme):
         self.setIconByTheme(theme)
diff --git a/Furious/Widget/Application.py b/Furious/Widget/Application.py
index c5ef140..083ceb6 100644
--- a/Furious/Widget/Application.py
+++ b/Furious/Widget/Application.py
@@ -285,13 +285,18 @@ class Application(ApplicationFactory, SingletonApplication):
         return backgroudColor.lightness() < 128
 
     def isDarkModeEnabled(self):
-        if SystemRuntime.flatpakID():
-            return self.isDarkMode()
+        # if SystemRuntime.flatpakID():
+        #     return self.isDarkMode()
+        #
+        # if not SystemRuntime.isAdmin():
+        #     return AppSettings.isStateON_('DarkMode')
+        # else:
+        #     return self.isDarkMode()
 
-        if not SystemRuntime.isAdmin():
-            return AppSettings.isStateON_('DarkMode')
-        else:
-            return self.isDarkMode()
+        return AppSettings.isStateON_('DarkMode')
+
+    def theme(self):
+        return 'Dark' if self.isDarkMode() else 'Light'
 
     def switchToDarkMode(self):
         self.setStyleSheet(qdarkstyle.load_stylesheet_pyside6())
@@ -301,7 +306,7 @@ class Application(ApplicationFactory, SingletonApplication):
     def switchToAutoMode(self):
         self.setStyleSheet('')
 
-        Mixins.ThemeAware.callThemeChangedCallbackUnchecked(darkdetect.theme())
+        Mixins.ThemeAware.callThemeChangedCallbackUnchecked(self.theme())
 
     @staticmethod
     @callOnceOnly
@@ -416,21 +421,21 @@ class Application(ApplicationFactory, SingletonApplication):
             logger.info(f'isPythonw: {SystemRuntime.isPythonw()}')
             logger.info(f'system language is {SYSTEM_LANGUAGE}')
             logger.info(self.customFontLoadMsg)
-            logger.info(f'current theme is {darkdetect.theme()}')
+            logger.info(f'current theme is {self.theme()}')
 
             if PLATFORM != 'Windows' and not SystemRuntime.isScriptMode():
                 logger.info('theme detect method uses timer implementation')
 
                 @QtCore.Slot()
                 def handleTimeout():
-                    currentTheme = darkdetect.theme()
+                    currentTheme = self.theme()
 
                     if self.currentTheme != currentTheme:
                         self.currentTheme = currentTheme
 
                         Mixins.ThemeAware.callThemeChangedCallback(currentTheme)
 
-                self.currentTheme = darkdetect.theme()
+                self.currentTheme = self.theme()
                 self.themeDetectTimer = QtCore.QTimer()
                 self.themeDetectTimer.timeout.connect(handleTimeout)
                 self.themeDetectTimer.start(1000)
diff --git a/Furious/Widget/SystemTrayIcon.py b/Furious/Widget/SystemTrayIcon.py
index 39499e2..6de82fc 100644
--- a/Furious/Widget/SystemTrayIcon.py
+++ b/Furious/Widget/SystemTrayIcon.py
@@ -25,7 +25,6 @@ from PySide6.QtWidgets import QSystemTrayIcon
 
 import logging
 import platform
-import darkdetect
 
 logger = logging.getLogger(__name__)
 
@@ -143,7 +142,7 @@ class SystemTrayIcon(
             switchMonochrome()
 
     def setMonochromeIcon(self):
-        self.setMonochromeIconByTheme(darkdetect.theme())
+        self.setMonochromeIconByTheme(APP().theme())
 
     def setDisconnectedIcon(self):
         if AppSettings.isStateON_('UseMonochromeTrayIcon'):
@@ -154,7 +153,7 @@ class SystemTrayIcon(
         if (
             PLATFORM == 'Darwin'
             or SystemRuntime.isWindows7()
-            or (PLATFORM == 'Windows' and darkdetect.theme() == 'Light')
+            or (PLATFORM == 'Windows' and APP().theme() == 'Light')
         ):
             # Darker
             self.setIcon(bootstrapIcon('rocket-takeoff-dark.svg'))
@@ -173,7 +172,7 @@ class SystemTrayIcon(
             if (
                 PLATFORM == 'Darwin'
                 or SystemRuntime.isWindows7()
-                or (PLATFORM == 'Windows' and darkdetect.theme() == 'Light')
+                or (PLATFORM == 'Windows' and APP().theme() == 'Light')
             ):
                 # Darker
                 self.setIcon(bootstrapIcon('rocket-takeoff-connected-dark.svg'))
@@ -202,7 +201,7 @@ class SystemTrayIcon(
     def themeChangedCallback(self, theme):
         if AppSettings.isStateON_('UseMonochromeTrayIcon'):
             # 'theme' is not used. Instead, always query current theme
-            self.setMonochromeIconByTheme(darkdetect.theme())
+            self.setMonochromeIconByTheme(APP().theme())
 
             return
 
diff --git a/Furious/Widget/XrayAssetViewerQListWidget.py b/Furious/Widget/XrayAssetViewerQListWidget.py
index 61ba725..8dae5b6 100644
--- a/Furious/Widget/XrayAssetViewerQListWidget.py
+++ b/Furious/Widget/XrayAssetViewerQListWidget.py
@@ -30,7 +30,6 @@ import shutil
 import logging
 import datetime
 import functools
-import darkdetect
 
 __all__ = ['XrayAssetViewerQListWidget']
 
@@ -65,7 +64,7 @@ class XrayAssetViewerQListWidget(Mixins.ThemeAware, AppQListWidget):
         self.setIconSize(QtCore.QSize(64, 64))
 
         if PLATFORM == 'Linux' and SystemRuntime.ubuntuRelease() == '20.04':
-            self.initialTheme = darkdetect.theme()
+            self.initialTheme = APP().theme()
         else:
             self.initialTheme = None
 
@@ -148,7 +147,7 @@ class XrayAssetViewerQListWidget(Mixins.ThemeAware, AppQListWidget):
             # Ubuntu 20.04. Flush by initial theme(Ubuntu 20.04 theme changes bug)
             self.flushItemByTheme(self.initialTheme)
         else:
-            self.flushItemByTheme(darkdetect.theme())
+            self.flushItemByTheme(APP().theme())
 
     def appendNewItem(self, filename: str):
         def append(_filename):