diff --git a/src/main.py b/src/main.py
index 6afcf4a..18b292b 100644
--- a/src/main.py
+++ b/src/main.py
@@ -28,6 +28,7 @@ def main():
         or len(app_settings.diff_pdfs) == 0
         or len(app_settings.java_vms) == 0
         or len(app_settings.saxon_jars) == 0
+        or len(app_settings.xsl_dirs) == 0
     ):
         # Als Modal Dialog öffnen!
         dlg = AppSettingsDlg(window, app_settings)
diff --git a/src/ui/AppSettings.py b/src/ui/AppSettings.py
index 43bd206..846d239 100644
--- a/src/ui/AppSettings.py
+++ b/src/ui/AppSettings.py
@@ -33,6 +33,12 @@ class JavaVmConfigDialog(QDialog):
         if file_path:
             self.ui.pathEdit.setText(file_path)
     
+    def set_data(self, data):
+        """Setzt die Daten in den Dialog."""
+        if data:
+            self.ui.versionEdit.setText(data.get('version', ''))
+            self.ui.pathEdit.setText(str(data.get('path_to_binary_file', '')))
+    
     def get_data(self):
         """Gibt die eingegebenen Daten zurück."""
         if not self.ui.versionEdit.text().strip() or not self.ui.pathEdit.text().strip():
@@ -66,6 +72,14 @@ class DiffPdfConfigDialog(QDialog):
         if file_path:
             self.ui.pathEdit.setText(file_path)
     
+    def set_data(self, data):
+        """Setzt die Daten in den Dialog."""
+        if data:
+            self.ui.versionEdit.setText(data.get('version', ''))
+            self.ui.pathEdit.setText(str(data.get('path_to_binary_file', '')))
+            self.ui.paramsEdit.setPlainText('\n'.join(data.get('default_params', [])))
+            self.ui.extensionEdit.setText(data.get('output_file_extension', 'pdf'))
+    
     def get_data(self):
         """Gibt die eingegebenen Daten zurück."""
         if not self.ui.versionEdit.text().strip() or not self.ui.pathEdit.text().strip():
@@ -105,6 +119,13 @@ class SaxonJarConfigDialog(QDialog):
         if file_path:
             self.ui.pathEdit.setText(file_path)
     
+    def set_data(self, data):
+        """Setzt die Daten in den Dialog."""
+        if data:
+            self.ui.versionEdit.setText(data.get('version', ''))
+            self.ui.pathEdit.setText(str(data.get('path_to_jar_file', '')))
+            self.ui.extensionEdit.setText(data.get('output_file_extension', 'fo'))
+    
     def get_data(self):
         """Gibt die eingegebenen Daten zurück."""
         if not self.ui.versionEdit.text().strip() or not self.ui.pathEdit.text().strip():
@@ -138,6 +159,13 @@ class ApacheFopConfigDialog(QDialog):
         if dir_path:
             self.ui.pathEdit.setText(dir_path)
     
+    def set_data(self, data):
+        """Setzt die Daten in den Dialog."""
+        if data:
+            self.ui.versionEdit.setText(data.get('version', ''))
+            self.ui.pathEdit.setText(str(data.get('path_to_dir', '')))
+            self.ui.extensionEdit.setText(data.get('output_file_extension', 'pdf'))
+    
     def get_data(self):
         """Gibt die eingegebenen Daten zurück."""
         if not self.ui.versionEdit.text().strip() or not self.ui.pathEdit.text().strip():
@@ -171,6 +199,12 @@ class XslDirConfigDialog(QDialog):
         if dir_path:
             self.ui.pathEdit.setText(dir_path)
     
+    def set_data(self, data):
+        """Setzt die Daten in den Dialog."""
+        if data:
+            self.ui.nameEdit.setText(data.get('name', ''))
+            self.ui.pathEdit.setText(str(data.get('path_to_root_dir', '')))
+    
     def get_data(self):
         """Gibt die eingegebenen Daten zurück."""
         if not self.ui.nameEdit.text().strip() or not self.ui.pathEdit.text().strip():
@@ -239,21 +273,33 @@ class AppSettingsDlg(QDialog):
         self.ui.tableDiffPdfs.itemSelectionChanged.connect(self._update_diff_pdf_buttons)
     
     def _setup_tables(self):
-        """Richtet die Tabellen-Header ein."""
+        """Richtet die Tabellen-Header ein und macht sie unveränderbar."""
+        from PySide6.QtWidgets import QAbstractItemView
+        
         # XSL-Ordner Tabelle
         self.ui.tableXsls.setHorizontalHeaderLabels(["Name", "Pfad"])
+        self.ui.tableXsls.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
+        self.ui.tableXsls.doubleClicked.connect(self._edit_xsl_dir)
         
         # Java VM Tabelle
         self.ui.tableJavaVms.setHorizontalHeaderLabels(["Version", "Pfad"])
+        self.ui.tableJavaVms.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
+        self.ui.tableJavaVms.doubleClicked.connect(self._edit_java_vm)
         
         # Saxon Tabelle
         self.ui.tableSaxons.setHorizontalHeaderLabels(["Version", "JAR-Pfad", "Extension"])
+        self.ui.tableSaxons.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
+        self.ui.tableSaxons.doubleClicked.connect(self._edit_saxon)
         
         # Apache FOP Tabelle
         self.ui.tableApacheFops.setHorizontalHeaderLabels(["Version", "Verzeichnis", "Extension"])
+        self.ui.tableApacheFops.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
+        self.ui.tableApacheFops.doubleClicked.connect(self._edit_apache_fop)
         
         # Diff PDF Tabelle
         self.ui.tableDiffPdfs.setHorizontalHeaderLabels(["Version", "Binary-Pfad", "Parameter", "Extension"])
+        self.ui.tableDiffPdfs.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
+        self.ui.tableDiffPdfs.doubleClicked.connect(self._edit_diff_pdf)
     
     def _populate_tables(self):
         """Füllt alle Tabellen mit den aktuellen Einstellungen."""
@@ -441,6 +487,125 @@ class AppSettingsDlg(QDialog):
         has_selection = self.ui.tableDiffPdfs.currentRow() >= 0
         self.ui.removeDiffPdf.setEnabled(has_selection)
     
+    # Bearbeitungsmethoden für Doppelklick-Events
+    def _edit_xsl_dir(self, index):
+        """Bearbeitet einen XSL-Ordner per Doppelklick."""
+        row = index.row()
+        if 0 <= row < len(self.temp_xsl_dirs):
+            xsl_dir = self.temp_xsl_dirs[row]
+            dialog = XslDirConfigDialog(self)
+            
+            # Vorhandene Daten setzen
+            data = {
+                'name': xsl_dir.name,
+                'path_to_root_dir': xsl_dir.path_to_root_dir
+            }
+            dialog.set_data(data)
+            
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                new_data = dialog.get_data()
+                if new_data:
+                    # Daten aktualisieren
+                    xsl_dir.name = new_data['name']
+                    xsl_dir.path_to_root_dir = new_data['path_to_root_dir']
+                    self._populate_xsl_table()
+    
+    def _edit_java_vm(self, index):
+        """Bearbeitet eine Java VM per Doppelklick."""
+        row = index.row()
+        if 0 <= row < len(self.temp_java_vms):
+            java_vm = self.temp_java_vms[row]
+            dialog = JavaVmConfigDialog(self)
+            
+            # Vorhandene Daten setzen
+            data = {
+                'version': java_vm.version,
+                'path_to_binary_file': java_vm.path_to_binary_file
+            }
+            dialog.set_data(data)
+            
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                new_data = dialog.get_data()
+                if new_data:
+                    # Daten aktualisieren
+                    java_vm.version = new_data['version']
+                    java_vm.path_to_binary_file = new_data['path_to_binary_file']
+                    self._populate_java_vm_table()
+    
+    def _edit_saxon(self, index):
+        """Bearbeitet eine Saxon JAR per Doppelklick."""
+        row = index.row()
+        if 0 <= row < len(self.temp_saxon_jars):
+            saxon = self.temp_saxon_jars[row]
+            dialog = SaxonJarConfigDialog(self)
+            
+            # Vorhandene Daten setzen
+            data = {
+                'version': saxon.version,
+                'path_to_jar_file': saxon.path_to_jar_file,
+                'output_file_extension': saxon.output_file_extension
+            }
+            dialog.set_data(data)
+            
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                new_data = dialog.get_data()
+                if new_data:
+                    # Daten aktualisieren
+                    saxon.version = new_data['version']
+                    saxon.path_to_jar_file = new_data['path_to_jar_file']
+                    saxon.output_file_extension = new_data['output_file_extension']
+                    self._populate_saxon_table()
+    
+    def _edit_apache_fop(self, index):
+        """Bearbeitet eine Apache FOP Konfiguration per Doppelklick."""
+        row = index.row()
+        if 0 <= row < len(self.temp_apache_fops):
+            fop = self.temp_apache_fops[row]
+            dialog = ApacheFopConfigDialog(self)
+            
+            # Vorhandene Daten setzen
+            data = {
+                'version': fop.version,
+                'path_to_dir': fop.path_to_dir,
+                'output_file_extension': fop.output_file_extension
+            }
+            dialog.set_data(data)
+            
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                new_data = dialog.get_data()
+                if new_data:
+                    # Daten aktualisieren
+                    fop.version = new_data['version']
+                    fop.path_to_dir = new_data['path_to_dir']
+                    fop.output_file_extension = new_data['output_file_extension']
+                    self._populate_apache_fop_table()
+    
+    def _edit_diff_pdf(self, index):
+        """Bearbeitet eine Diff PDF Konfiguration per Doppelklick."""
+        row = index.row()
+        if 0 <= row < len(self.temp_diff_pdfs):
+            diff_pdf = self.temp_diff_pdfs[row]
+            dialog = DiffPdfConfigDialog(self)
+            
+            # Vorhandene Daten setzen
+            data = {
+                'version': diff_pdf.version,
+                'path_to_binary_file': diff_pdf.path_to_binary_file,
+                'default_params': diff_pdf.default_params,
+                'output_file_extension': diff_pdf.output_file_extension
+            }
+            dialog.set_data(data)
+            
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                new_data = dialog.get_data()
+                if new_data:
+                    # Daten aktualisieren
+                    diff_pdf.version = new_data['version']
+                    diff_pdf.path_to_binary_file = new_data['path_to_binary_file']
+                    diff_pdf.default_params = new_data['default_params']
+                    diff_pdf.output_file_extension = new_data['output_file_extension']
+                    self._populate_diff_pdf_table()
+    
     def accept(self):
         """Übernimmt die Änderungen und schließt den Dialog."""
         # Aktualisiere die ursprünglichen Einstellungen
diff --git a/src/ui/AppSettings.ui b/src/ui/AppSettings.ui
index b17b47b..6db3f24 100644
--- a/src/ui/AppSettings.ui
+++ b/src/ui/AppSettings.ui
@@ -20,7 +20,7 @@
       <bool>true</bool>
      </property>
      <property name="currentIndex">
-      <number>5</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="tabXsls">
       <attribute name="title">
diff --git a/src/ui/AppSettings_ui.py b/src/ui/AppSettings_ui.py
index c15b045..daf4eaf 100644
--- a/src/ui/AppSettings_ui.py
+++ b/src/ui/AppSettings_ui.py
@@ -280,7 +280,7 @@ class Ui_Dialog(object):
         self.buttonBox.accepted.connect(Dialog.accept)
         self.buttonBox.rejected.connect(Dialog.reject)
 
-        self.tabSettings.setCurrentIndex(5)
+        self.tabSettings.setCurrentIndex(0)
 
 
         QMetaObject.connectSlotsByName(Dialog)