diff --git a/forms/mainwindow.py b/forms/mainwindow.py
--- a/forms/mainwindow.py
+++ b/forms/mainwindow.py
@@ -51,6 +51,8 @@ class CustomTableModel(QtCore.QAbstractT
     def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
         if orientation == QtCore.Qt.Horizontal and role == QtCore.Qt.DisplayRole:
             return QtCore.QVariant(self.headers[section])
+        elif orientation == QtCore.Qt.Vertical and role == QtCore.Qt.DisplayRole:
+            return QtCore.QVariant(section)
         return super().headerData(section, orientation, role)
 
     def rowCount(self, parent=None):
diff --git a/ui/format_dialog.ui b/ui/format_dialog.ui
--- a/ui/format_dialog.ui
+++ b/ui/format_dialog.ui
@@ -32,7 +32,11 @@
    <item>
     <layout class="QGridLayout" name="gridLayout">
      <item row="1" column="1">
-      <widget class="QSpinBox" name="sb_to"/>
+      <widget class="QSpinBox" name="sb_to">
+       <property name="maximum">
+        <number>999</number>
+       </property>
+      </widget>
      </item>
      <item row="0" column="1">
       <widget class="QLabel" name="label_2">