diff --git a/src/MainWindow.ui b/src/MainWindow.ui
index 12115fd6..f80b2b21 100644
--- a/src/MainWindow.ui
+++ b/src/MainWindow.ui
@@ -22,7 +22,7 @@
     <item>
      <widget class="QTabWidget" name="mainTab">
       <property name="currentIndex">
-       <number>3</number>
+       <number>0</number>
       </property>
       <widget class="QWidget" name="structure">
        <attribute name="title">
diff --git a/src/PreferencesDialog.ui b/src/PreferencesDialog.ui
index aba05d35..b7e01139 100644
--- a/src/PreferencesDialog.ui
+++ b/src/PreferencesDialog.ui
@@ -20,7 +20,7 @@
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
-      <number>4</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="tab_4">
       <attribute name="title">