diff --git a/idd/LGIddHelper/CConfigWindow.cpp b/idd/LGIddHelper/CConfigWindow.cpp
index 6f64fe33..815f4d9a 100644
--- a/idd/LGIddHelper/CConfigWindow.cpp
+++ b/idd/LGIddHelper/CConfigWindow.cpp
@@ -57,11 +57,20 @@ void CConfigWindow::updateFont()
 
   for (HWND child : std::initializer_list<HWND>({
     *m_version, *m_modeGroup, *m_modeBox, *m_widthLabel, *m_heightLabel, *m_refreshLabel,
-    *m_modeWidth, *m_modeHeight, *m_modeRefresh, *m_modeUpdate,
+    *m_modeWidth, *m_modeHeight, *m_modeRefresh, *m_modeUpdate, *m_modeDelete,
   }))
     SendMessage(child, WM_SETFONT, (WPARAM)m_font.Get(), 1);
 }
 
+void CConfigWindow::updateModeList()
+{
+  m_modeBox->addItem(L"<add new>", -1);
+
+  auto &modes = *m_modes;
+  for (size_t i = 0; i < modes.size(); ++i)
+    m_modeBox->addItem(modes[i].toString(), i);
+}
+
 LRESULT CConfigWindow::handleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
   switch (uMsg)
@@ -95,13 +104,7 @@ LRESULT CConfigWindow::onCreate()
 
   m_modeBox.reset(new CListBox(WS_CHILD | WS_VISIBLE | LBS_NOTIFY, m_hwnd));
   if (m_modes)
-  {
-    m_modeBox->addItem(L"<add new>", -1);
-
-    auto &modes = *m_modes;
-    for (size_t i = 0; i < modes.size(); ++i)
-      m_modeBox->addItem(modes[i].toString(), i);
-  }
+    updateModeList();
 
   m_widthLabel.reset(new CStaticWidget(L"Width:", WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE, m_hwnd));
   m_heightLabel.reset(new CStaticWidget(L"Height:", WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE, m_hwnd));
@@ -112,7 +115,9 @@ LRESULT CConfigWindow::onCreate()
   m_modeRefresh.reset(new CEditWidget(WS_CHILD | WS_VISIBLE | ES_LEFT, m_hwnd));
 
   m_modeUpdate.reset(new CButton(L"Save", WS_CHILD | WS_VISIBLE, m_hwnd));
+  m_modeDelete.reset(new CButton(L"Delete", WS_CHILD | WS_VISIBLE, m_hwnd));
   EnableWindow(*m_modeUpdate, FALSE);
+  EnableWindow(*m_modeDelete, FALSE);
 
   updateFont();
 
@@ -139,36 +144,38 @@ LRESULT CConfigWindow::onResize(DWORD width, DWORD height)
   pos.pinBottomLeft(*m_modeHeight, 75, 72, 50, 20);
   pos.pinBottomLeft(*m_modeRefresh, 75, 48, 50, 20);
   pos.pinBottomLeft(*m_modeUpdate, 24, 20, 50, 24);
+  pos.pinBottomLeft(*m_modeDelete, 75, 20, 50, 24);
   return 0;
 }
 
+void CConfigWindow::onModeListSelectChange()
+{
+  int sel = m_modeBox->getSel();
+  if (sel == LB_ERR)
+  {
+    EnableWindow(*m_modeUpdate, FALSE);
+    EnableWindow(*m_modeDelete, FALSE);
+    return;
+  }
+
+  int index = m_modeBox->getData(sel);
+
+  if (index >= 0)
+  {
+    auto &mode = (*m_modes)[index];
+    m_modeWidth->setNumericValue(mode.width);
+    m_modeHeight->setNumericValue(mode.height);
+    m_modeRefresh->setNumericValue(mode.refresh);
+  }
+  EnableWindow(*m_modeUpdate, TRUE);
+  EnableWindow(*m_modeDelete, index >= 0);
+}
+
 LRESULT CConfigWindow::onCommand(WORD id, WORD code, HWND hwnd)
 {
   if (hwnd == *m_modeBox && code == LBN_SELCHANGE && m_modes)
   {
-    int sel = m_modeBox->getSel();
-    if (sel == LB_ERR)
-    {
-      EnableWindow(*m_modeUpdate, FALSE);
-      return 0;
-    }
-
-    int index = m_modeBox->getData(sel);
-
-    if (index >= 0)
-    {
-      auto &mode = (*m_modes)[index];
-      m_modeWidth->setNumericValue(mode.width);
-      m_modeHeight->setNumericValue(mode.height);
-      m_modeRefresh->setNumericValue(mode.refresh);
-    }
-    else
-    {
-      m_modeWidth->setValue(L"");
-      m_modeHeight->setValue(L"");
-      m_modeRefresh->setValue(L"");
-    }
-    EnableWindow(*m_modeUpdate, TRUE);
+    onModeListSelectChange();
   }
   else if (hwnd == *m_modeUpdate && code == BN_CLICKED && m_modes)
   {
@@ -191,5 +198,22 @@ LRESULT CConfigWindow::onCommand(WORD id, WORD code, HWND hwnd)
     if (result != ERROR_SUCCESS)
       DEBUG_ERROR_HR(result, "Failed to save modes");
   }
+  else if (hwnd == *m_modeDelete && code == BN_CLICKED && m_modes)
+  {
+    int sel = m_modeBox->getSel();
+    if (sel == LB_ERR)
+      return 0;
+
+    int index = m_modeBox->getData(sel);
+    m_modeBox->clear();
+    m_modes->erase(m_modes->begin() + index);
+
+    LRESULT result = m_settings.setModes(*m_modes);
+    if (result != ERROR_SUCCESS)
+      DEBUG_ERROR_HR(result, "Failed to save modes");
+
+    updateModeList();
+    onModeListSelectChange();
+  }
   return 0;
 }
diff --git a/idd/LGIddHelper/CConfigWindow.h b/idd/LGIddHelper/CConfigWindow.h
index e0c40a29..6c85010f 100644
--- a/idd/LGIddHelper/CConfigWindow.h
+++ b/idd/LGIddHelper/CConfigWindow.h
@@ -30,6 +30,7 @@ class CConfigWindow : public CWindow
   std::unique_ptr<CEditWidget> m_modeRefresh;
 
   std::unique_ptr<CButton> m_modeUpdate;
+  std::unique_ptr<CButton> m_modeDelete;
 
   std::function<void()> m_onDestroy;
   double m_scale;
@@ -38,6 +39,8 @@ class CConfigWindow : public CWindow
   std::optional<std::vector<DisplayMode>> m_modes;
 
   void updateFont();
+  void updateModeList();
+  void onModeListSelectChange();
 
   virtual LRESULT handleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam) override;
   virtual LRESULT onCreate() override;
diff --git a/idd/LGIddHelper/CListBox.cpp b/idd/LGIddHelper/CListBox.cpp
index 5beb9563..6bfa40b0 100644
--- a/idd/LGIddHelper/CListBox.cpp
+++ b/idd/LGIddHelper/CListBox.cpp
@@ -50,3 +50,8 @@ void CListBox::setSel(int index)
   if (!ListBox_SetCurSel(m_hwnd, index))
     DEBUG_ERROR("listbox: failed to set selection to %d", index);
 }
+
+void CListBox::clear()
+{
+  ListBox_ResetContent(m_hwnd);
+}
diff --git a/idd/LGIddHelper/CListBox.h b/idd/LGIddHelper/CListBox.h
index 18fd4440..360e7077 100644
--- a/idd/LGIddHelper/CListBox.h
+++ b/idd/LGIddHelper/CListBox.h
@@ -12,4 +12,5 @@ public:
   int getSel();
   int getData(int index);
   void setSel(int index);
+  void clear();
 };