diff --git a/Scripts/GUI/Show-MainWindow.ps1 b/Scripts/GUI/Show-MainWindow.ps1
index 409b02d..c022240 100644
--- a/Scripts/GUI/Show-MainWindow.ps1
+++ b/Scripts/GUI/Show-MainWindow.ps1
@@ -14,16 +14,52 @@ function Show-MainWindow {
             [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
             private struct POINT { public int x, y; }
 
+            [System.Runtime.InteropServices.DllImport("user32.dll")]
+            private static extern System.IntPtr MonitorFromWindow(System.IntPtr hwnd, uint dwFlags);
+
+            [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
+            private static extern bool GetMonitorInfo(System.IntPtr hMonitor, ref MONITORINFO lpmi);
+
+            [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
+            private struct RECT {
+                public int Left, Top, Right, Bottom;
+            }
+
+            [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
+            private struct MONITORINFO {
+                public int cbSize;
+                public RECT rcMonitor;
+                public RECT rcWork;
+                public uint dwFlags;
+            }
+
             public static System.IntPtr WmGetMinMaxInfoHook(
                 System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) {
                 if (msg == 0x0024) { // WM_GETMINMAXINFO
-                    var wa = System.Windows.Forms.Screen.FromHandle(hwnd).WorkingArea;
                     var mmi = (MINMAXINFO)System.Runtime.InteropServices.Marshal.PtrToStructure(
                         lParam, typeof(MINMAXINFO));
-                    mmi.ptMaxPosition.x = wa.Left;
-                    mmi.ptMaxPosition.y = wa.Top;
-                    mmi.ptMaxSize.x     = wa.Width;
-                    mmi.ptMaxSize.y     = wa.Height;
+
+                    const uint MONITOR_DEFAULTTONEAREST = 0x00000002;
+                    var monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
+                    var monitorInfo = new MONITORINFO();
+                    monitorInfo.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(MONITORINFO));
+
+                    if (monitor != System.IntPtr.Zero && GetMonitorInfo(monitor, ref monitorInfo)) {
+                        mmi.ptMaxPosition.x = monitorInfo.rcWork.Left - monitorInfo.rcMonitor.Left;
+                        mmi.ptMaxPosition.y = monitorInfo.rcWork.Top - monitorInfo.rcMonitor.Top;
+                        mmi.ptMaxSize.x     = monitorInfo.rcWork.Right - monitorInfo.rcWork.Left;
+                        mmi.ptMaxSize.y     = monitorInfo.rcWork.Bottom - monitorInfo.rcWork.Top;
+                    }
+                    else {
+                        var screen = System.Windows.Forms.Screen.FromHandle(hwnd);
+                        var wa = screen.WorkingArea;
+                        var bounds = screen.Bounds;
+                        mmi.ptMaxPosition.x = wa.Left - bounds.Left;
+                        mmi.ptMaxPosition.y = wa.Top - bounds.Top;
+                        mmi.ptMaxSize.x     = wa.Width;
+                        mmi.ptMaxSize.y     = wa.Height;
+                    }
+
                     System.Runtime.InteropServices.Marshal.StructureToPtr(mmi, lParam, true);
                 }
                 return System.IntPtr.Zero;
@@ -66,19 +102,28 @@ function Show-MainWindow {
     $normalWindowShadow = $mainBorder.Effect
     $initialNormalMaxWidth = 1400.0
 
+    $convertScreenPointToDip = {
+        param(
+            [double]$x,
+            [double]$y
+        )
+
+        $source = [System.Windows.PresentationSource]::FromVisual($window)
+        if ($null -eq $source -or $null -eq $source.CompositionTarget) {
+            return [System.Windows.Point]::new($x, $y)
+        }
+
+        return $source.CompositionTarget.TransformFromDevice.Transform([System.Windows.Point]::new($x, $y))
+    }
+
     $convertScreenPixelsToDip = {
         param(
             [double]$width,
             [double]$height
         )
 
-        $source = [System.Windows.PresentationSource]::FromVisual($window)
-        if ($null -eq $source -or $null -eq $source.CompositionTarget) {
-            return [System.Windows.Size]::new($width, $height)
-        }
-
-        $topLeft = $source.CompositionTarget.TransformFromDevice.Transform([System.Windows.Point]::new(0, 0))
-        $bottomRight = $source.CompositionTarget.TransformFromDevice.Transform([System.Windows.Point]::new($width, $height))
+        $topLeft = & $convertScreenPointToDip 0 0
+        $bottomRight = & $convertScreenPointToDip $width $height
         return [System.Windows.Size]::new($bottomRight.X - $topLeft.X, $bottomRight.Y - $topLeft.Y)
     }
 
@@ -122,9 +167,10 @@ function Show-MainWindow {
             return
         }
 
+        $workingAreaTopLeftDip = & $convertScreenPointToDip $screen.WorkingArea.Left $screen.WorkingArea.Top
         $workingAreaDip = & $convertScreenPixelsToDip $screen.WorkingArea.Width $screen.WorkingArea.Height
         $window.Width = [Math]::Min($initialNormalMaxWidth, $workingAreaDip.Width)
-        $window.Left = $screen.WorkingArea.Left + (($workingAreaDip.Width - $window.Width) / 2)
+        $window.Left = $workingAreaTopLeftDip.X + (($workingAreaDip.Width - $window.Width) / 2)
     }
 
     $window.Add_SourceInitialized({