diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index a025b6f..f89b82d 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -193,6 +193,9 @@ void MainWindow::initWindowSize()
     case Settings::WindowSizeBehavior::Maximized:
         showMaximized();
         break;
+    case Settings::WindowSizeBehavior::Windowed:
+        showNormal();
+        break;
     default:
         adjustWindowSizeBySceneRect();
         break;
diff --git a/app/settings.h b/app/settings.h
index b79f770..1d92087 100644
--- a/app/settings.h
+++ b/app/settings.h
@@ -28,6 +28,7 @@ public:
     enum WindowSizeBehavior {
         Auto,
         Maximized,
+        Windowed,
     };
     Q_ENUM(WindowSizeBehavior)
 
diff --git a/app/settingsdialog.cpp b/app/settingsdialog.cpp
index fb2efa6..c37ee34 100644
--- a/app/settingsdialog.cpp
+++ b/app/settingsdialog.cpp
@@ -86,7 +86,8 @@ SettingsDialog::SettingsDialog(QWidget *parent)
 
     static QList< QPair<Settings::WindowSizeBehavior, QString> > _iws_options {
         { Settings::WindowSizeBehavior::Auto, tr("Auto size") },
-        { Settings::WindowSizeBehavior::Maximized, tr("Maximized") }
+        { Settings::WindowSizeBehavior::Maximized, tr("Maximized") },
+        { Settings::WindowSizeBehavior::Windowed, tr("Windowed") }
     };
 
     static QList< QPair<Qt::HighDpiScaleFactorRoundingPolicy, QString> > _hidpi_options {