diff --git a/sources/configdialog.cpp b/sources/configdialog.cpp
index 99442496a..04457dc2b 100644
--- a/sources/configdialog.cpp
+++ b/sources/configdialog.cpp
@@ -79,8 +79,16 @@ ConfigDialog::ConfigDialog(QWidget *parent) : QDialog(parent) {
 	connect(pages_list, SIGNAL(currentRowChanged(int)),
 		pages_widget, SLOT(setCurrentIndex(int)));
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	// set maximum a bit smaller than available size = (screen-size - Task-Bar):
+	// "primaryScreen" <-> the screen where the main widget of application resides
+	setMaximumSize((int)(0.95 * QGuiApplication::primaryScreen()->availableSize().width()),
+				   (int)(0.95 * QGuiApplication::primaryScreen()->availableSize().height()));
+#else
+	// set maximum smaller than screen-size
 	setMaximumSize((int)(0.85 * MachineInfo::instance()->i_max_screen_width()),
 				   (int)(0.85 * MachineInfo::instance()->i_max_screen_height()));
+#endif
 	resize(std::min(1400,maximumWidth()),
 		   std::min(1000,maximumHeight()));