diff --git a/src/brovski-adress-etiketten-verwaltung.py b/src/brovski-adress-etiketten-verwaltung.py
index 59229e1..c056f39 100644
--- a/src/brovski-adress-etiketten-verwaltung.py
+++ b/src/brovski-adress-etiketten-verwaltung.py
@@ -143,8 +143,10 @@ class Application:
         self.config = Config()
         self.config_good = False
 
+        # variables
         self.address_list = []
         self.current_record: int | None = None
+        self.sort_order = False
 
         # init paths to json and csv file
         self.json_file_name = "brovski-adress-etiketten-verwaltung.json"
@@ -203,6 +205,7 @@ class Application:
                                   show="headings")
         scrollbar.config(command=self.table.yview)
         self.table.heading('0', text="Aktiv")
+        self.table.column('0', anchor=tk.CENTER, width=0)
         self.table.heading('1', text="Firma")
         self.table.heading('2', text="Name")
         self.table.heading('3', text="Strasse")
@@ -280,22 +283,23 @@ class Application:
             column = self.table.identify_column(event.x)
             match column:
                 case "#1":
-                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1])
+                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1], reverse=self.sort_order)
                     self.populate_table()
                 case "#2":
-                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1])
+                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1], reverse=self.sort_order)
                     self.populate_table()
                 case "#3":
-                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1])
+                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1], reverse=self.sort_order)
                     self.populate_table()
                 case "#4":
-                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1])
+                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1], reverse=self.sort_order)
                     self.populate_table()
                 case "#5":
-                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1])
+                    self.address_list.sort(key=lambda x: x[int(column[-1]) - 1], reverse=self.sort_order)
                     self.populate_table()
                 case _:
                     print(column)
+            self.sort_order = not self.sort_order
 
         if region == "cell":
             self.current_record = self.table.focus()