diff --git a/src/musredit_qt6/mupp/PmuppAdmin.cpp b/src/musredit_qt6/mupp/PmuppAdmin.cpp
index c34f1f23..35c38e03 100644
--- a/src/musredit_qt6/mupp/PmuppAdmin.cpp
+++ b/src/musredit_qt6/mupp/PmuppAdmin.cpp
@@ -156,8 +156,12 @@ bool PmuppAdminXMLParser::startElement()
 
   if (qName == "path_file_name") {
     fKeyWord = eRecentFile;
-  } else if (qName == "dark_theme") {
-    fKeyWord = eDarkTheme;
+  } else if (qName == "ignore_theme_auto_detection") {
+    fKeyWord = eIgnoreThemeAutoDetection;
+  } else if (qName == "dark_theme_icons_menu") {
+    fKeyWord = eDarkThemeIconsMenu;
+  } else if (qName == "dark_theme_icons_toolbar") {
+    fKeyWord = eDarkThemeIconsToolbar;
   } else if (qName == "marker") {
     fKeyWord = eMarker;
   } else if (qName == "color") {
@@ -201,11 +205,23 @@ bool PmuppAdminXMLParser::characters()
     case eRecentFile:
       fAdmin->addRecentFile(QString(str.toLatin1()).trimmed());
       break;
-    case eDarkTheme:
-      if ((str == "yes") || (str == "1") || (str == "true"))
-        fAdmin->setTheme(true);
+    case eIgnoreThemeAutoDetection:
+      if ((str == "yes") || (str == "y") || (str == "1") || (str == "true"))
+        fAdmin->setIgnoreThemeAutoDetection(true);
       else
-        fAdmin->setTheme(false);
+        fAdmin->setIgnoreThemeAutoDetection(false);
+      break;
+    case eDarkThemeIconsMenu:
+      if ((str == "yes") || (str == "1") || (str == "true"))
+        fAdmin->setThemeIconsMenu(true);
+      else
+        fAdmin->setThemeIconsMenu(false);
+      break;
+    case eDarkThemeIconsToolbar:
+      if ((str == "yes") || (str == "1") || (str == "true"))
+        fAdmin->setThemeIconsToolbar(true);
+      else
+        fAdmin->setThemeIconsToolbar(false);
       break;
     case eMarker:
       tok = str.split(",", Qt::SkipEmptyParts);
@@ -272,7 +288,7 @@ bool PmuppAdminXMLParser::endDocument()
  * <p>Initializes that PmuppAdmin object, and calls the XML parser which feeds
  * the object variables.
  */
-PmuppAdmin::PmuppAdmin() : QObject(), fDarkTheme(false)
+PmuppAdmin::PmuppAdmin() : QObject()
 {
   // XML Parser part
   // 1st: check local directory
@@ -433,7 +449,7 @@ void PmuppAdmin::getColor(int idx, int &r, int &g, int &b)
  * @param marker marker code
  * @param size marker size
  */
-void PmuppAdmin::setMarker(int marker, double size)
+void PmuppAdmin::setMarker(const int marker, const double size)
 {
   PmuppMarker markerObj;
 
@@ -456,7 +472,7 @@ void PmuppAdmin::setMarker(int marker, double size)
  * @param b blue value (0..255)
  * @param name color name
  */
-void PmuppAdmin::setColor(int r, int g, int b, QString name)
+void PmuppAdmin::setColor(const int r, const int g, const int b, QString name)
 {
   if (((r<0) || (r>255)) ||
       ((g<0) || (g>255)) ||
diff --git a/src/musredit_qt6/mupp/PmuppAdmin.h b/src/musredit_qt6/mupp/PmuppAdmin.h
index 3683f52d..672c8958 100644
--- a/src/musredit_qt6/mupp/PmuppAdmin.h
+++ b/src/musredit_qt6/mupp/PmuppAdmin.h
@@ -102,7 +102,9 @@ class PmuppAdminXMLParser
     virtual bool isValid() { return fValid; }
 
   private:
-    enum EAdminKeyWords {eEmpty, eRecentFile, eDarkTheme, eMarker, eColor};
+    enum EAdminKeyWords {eEmpty, eRecentFile,
+                         eIgnoreThemeAutoDetection, eDarkThemeIconsMenu, eDarkThemeIconsToolbar,
+                         eMarker, eColor};
 
     bool parse(QIODevice *device);
     bool startDocument();
@@ -145,18 +147,24 @@ class PmuppAdmin : public QObject
     void getColor(QString name, int &r, int &g, int &b);
     void getColor(int idx, int &r, int &g, int &b);
 
-    bool isDarkTheme() { return fDarkTheme; }
+    bool getIgnoreThemeAutoDetection() { return fIgnoreThemeAutoDetection; }
+    bool getDarkThemeIconsMenuFlag() { return fDarkThemeIconsMenu; }
+    bool getDarkThemeIconsToolbarFlag() { return fDarkThemeIconsToolbar; }
 
-    void setTheme(bool theme) { fDarkTheme = theme; }
-    void setMarker(int marker, double size);
-    void setColor(int r, int g, int b, QString name="");
+    void setIgnoreThemeAutoDetection(const bool theme) { fIgnoreThemeAutoDetection = theme; }
+    void setThemeIconsMenu(const bool theme) { fDarkThemeIconsMenu = theme; }
+    void setThemeIconsToolbar(const bool theme) { fDarkThemeIconsToolbar = theme; }
+    void setMarker(const int marker, const double size);
+    void setColor(const int r, const int g, const int b, QString name="");
 
   private:
     friend class PmuppAdminXMLParser;
 
     QVector<QString> fRecentFile; ///< keep vector of recent path-file names
 
-    bool fDarkTheme;
+    bool fIgnoreThemeAutoDetection{false};
+    bool fDarkThemeIconsMenu{false};
+    bool fDarkThemeIconsToolbar{false};
     QVector<PmuppMarker> fMarker;
     QVector<PmuppColor> fColor;
 
diff --git a/src/musredit_qt6/mupp/PmuppGui.cpp b/src/musredit_qt6/mupp/PmuppGui.cpp
index b526f1e7..7f0482a7 100644
--- a/src/musredit_qt6/mupp/PmuppGui.cpp
+++ b/src/musredit_qt6/mupp/PmuppGui.cpp
@@ -270,7 +270,7 @@ PmuppGui::PmuppGui(QStringList fln)
   getTheme();
 
   QString iconName("");
-  if (fDarkTheme)
+  if (fDarkThemeIconsMenu)
     iconName = QString(":/icons/mupp-dark.svg");
   else
     iconName = QString(":/icons/mupp-plain.svg");
@@ -513,7 +513,7 @@ void PmuppGui::setupFileActions()
   QAction *a;
 
   QString iconName("");
-  if (fDarkTheme)
+  if (fDarkThemeIconsMenu)
     iconName = QString(":/icons/document-open-dark.svg");
   else
     iconName = QString(":/icons/document-open-plain.svg");
@@ -522,7 +522,7 @@ void PmuppGui::setupFileActions()
   a->setStatusTip( tr("Open a musrfit parameter file.") );
   connect( a, SIGNAL( triggered() ), this, SLOT( fileOpen() ) );
   menu->addAction(a);
-  if (!fDarkToolBarIcon) { // tool bar icon is not dark, even though the theme is (ubuntu)
+  if (!fDarkThemeIconsToolbar) { // tool bar icon is not dark, even though the theme is (ubuntu, mx, xfce)
     iconName = QString(":/icons/document-open-plain.svg");
     a = new QAction( QIcon( QPixmap(iconName) ), tr( "&New..." ), this );
     connect( a, SIGNAL( triggered() ), this, SLOT( fileOpen() ) );
@@ -847,26 +847,32 @@ bool PmuppGui::eventFilter(QObject *o, QEvent *e)
  */
 void PmuppGui::getTheme()
 {
-  fDarkTheme = false; // true if theme is dark
-  fDarkToolBarIcon = false; // needed for ubuntu dark since there the menu icons
-                            // are dark, however the toolbar icons are plain!
+  if (fIgnoreThemeAutoDetection)
+    return;
+
+  fDarkThemeIconsMenu = false; // true if theme is dark
+  fDarkThemeIconsToolbar = false; // needed for ubuntu dark since there the menu icons
+                                  // are dark, however the toolbar icons are plain!
 
   QString str = QIcon::themeName();
 
   if (str.isEmpty()) {
-    if (fAdmin->isDarkTheme()) {
-      fDarkTheme = true;
-      fDarkToolBarIcon = true;
+    if (fAdmin->getDarkThemeIconsMenuFlag()) {
+      fDarkThemeIconsMenu = true;
+    }
+    if (fAdmin->getDarkThemeIconsToolbarFlag()) {
+      fDarkThemeIconsToolbar = true;
     }
     return;
   }
 
   if (str.contains("dark", Qt::CaseInsensitive)) {
-    fDarkTheme = true;
-    if (str.contains("ubuntu", Qt::CaseInsensitive)) {
-      fDarkToolBarIcon = false;
+    fDarkThemeIconsMenu = true;
+    if (str.contains("ubuntu", Qt::CaseInsensitive) ||
+            str.contains("xfce", Qt::CaseInsensitive)) {
+      fDarkThemeIconsToolbar = false;
     } else {
-      fDarkToolBarIcon = true;
+      fDarkThemeIconsToolbar = true;
     }
   }
 }
@@ -1304,7 +1310,7 @@ void PmuppGui::addVar()
 
   // call variable dialog
   fVarDlg.reset();
-  fVarDlg = std::make_unique<PVarDialog>(collection_list, fDarkTheme);
+  fVarDlg = std::make_unique<PVarDialog>(collection_list, fDarkThemeIconsMenu);
   connect(fVarDlg.get(), SIGNAL(check_request(QString,QVector<int>)), this, SLOT(check(QString,QVector<int>)));
   connect(fVarDlg.get(), SIGNAL(add_request(QString,QVector<int>)), this, SLOT(add(QString,QVector<int>)));
   fVarDlg->show();
diff --git a/src/musredit_qt6/mupp/PmuppGui.h b/src/musredit_qt6/mupp/PmuppGui.h
index c811a8a5..5eb2396d 100644
--- a/src/musredit_qt6/mupp/PmuppGui.h
+++ b/src/musredit_qt6/mupp/PmuppGui.h
@@ -159,9 +159,10 @@ private:
   enum EAxis {kXaxis, kYaxis};
 
   PmuppAdmin *fAdmin;
-  bool fDarkTheme;
-  bool fDarkToolBarIcon;
-  bool fNormalize;
+  bool fIgnoreThemeAutoDetection{false};
+  bool fDarkThemeIconsMenu{false};
+  bool fDarkThemeIconsToolbar{false};
+  bool fNormalize{false};
 
   qint64 fDatime;
   uint fMuppInstance;
diff --git a/src/musredit_qt6/mupp/mupp_startup.xml.in b/src/musredit_qt6/mupp/mupp_startup.xml.in
index f7e218c3..70ca0a4a 100644
--- a/src/musredit_qt6/mupp/mupp_startup.xml.in
+++ b/src/musredit_qt6/mupp/mupp_startup.xml.in
@@ -5,7 +5,9 @@
     </comment>
     <recent_files>
     </recent_files>
-    <dark_theme>no</dark_theme>
+    <ignore_theme_auto_detection>n</ignore_theme_auto_detection>
+    <dark_theme_icon_menu>n</dark_theme_icon_menu>
+    <dark_theme_icon_toolbar>n</dark_theme_icon_toolbar>
     <root_settings>
         <marker_list>
             <!-- Root marker numbers -->