diff --git a/kcmkwin/kwinscreenedges/touch.cpp b/kcmkwin/kwinscreenedges/touch.cpp
--- a/kcmkwin/kwinscreenedges/touch.cpp
+++ b/kcmkwin/kwinscreenedges/touch.cpp
@@ -252,7 +252,7 @@
     KConfigGroup tabBoxConfig(m_config, "TabBox");
     list.clear();
     // TabBox
-    list.append(int(ElectricNone));
+    list.append(int(ElectricLeft));
     list = tabBoxConfig.readEntry("TouchBorderActivate", list);
     foreach (int i, list) {
         monitorChangeEdge(ElectricBorder(i), int(TabBox));
@@ -347,6 +347,8 @@
     // Clear all edges
     for (int i = 0; i < 8; i++)
         m_ui->monitor->selectEdgeItem(i, 0);
+    // select TabBox
+    m_ui->monitor->selectEdgeItem(int(Monitor::Left), int(TabBox));
 }
 
 void KWinScreenEdgesConfig::monitorShowEvent()
diff --git a/tabbox/tabbox.cpp b/tabbox/tabbox.cpp
--- a/tabbox/tabbox.cpp
+++ b/tabbox/tabbox.cpp
@@ -821,14 +821,14 @@
         borderConfig = QStringLiteral("BorderAlternativeActivate");
     }
 
-    auto touchConfig = [this, config] (const QString &key, QHash<ElectricBorder, QAction *> &actions, TabBoxMode mode) {
+    auto touchConfig = [this, config] (const QString &key, QHash<ElectricBorder, QAction *> &actions, TabBoxMode mode, const QStringList &defaults = QStringList{}) {
         // fist erase old config
         for (auto it = actions.begin(); it != actions.end(); ) {
             delete it.value();
             it = actions.erase(it);
         }
         // now new config
-        const QStringList list = config.readEntry(key, QStringList());
+        const QStringList list = config.readEntry(key, defaults);
         for (const auto &s : list) {
             bool ok;
             const int i = s.toInt(&ok);
@@ -841,7 +841,7 @@
             actions.insert(ElectricBorder(i), a);
         }
     };
-    touchConfig(QStringLiteral("TouchBorderActivate"), m_touchActivate, TabBoxWindowsMode);
+    touchConfig(QStringLiteral("TouchBorderActivate"), m_touchActivate, TabBoxWindowsMode, QStringList{QString::number(int(ElectricLeft))});
     touchConfig(QStringLiteral("TouchBorderAlternativeActivate"), m_touchAlternativeActivate, TabBoxWindowsAlternativeMode);
 }