diff -r 08dc62e03a6d -r c6114b3af3a6 src/mainwindow.cpp
--- a/src/mainwindow.cpp	Sun Feb 02 00:50:57 2020 +0200
+++ b/src/mainwindow.cpp	Sun Feb 02 00:51:06 2020 +0200
@@ -317,6 +317,7 @@
 	this->renderPreferences.style = static_cast<gl::RenderStyle>(this->settings.renderStyle());
 	this->renderPreferences.mainColor = this->settings.mainColor();
 	this->renderPreferences.backgroundColor = this->settings.backgroundColor();
+	this->renderPreferences.lineThickness = this->settings.lineThickness();
 	const QString systemLocale = QLocale::system().name();
 	const QVariant defaultLocale = this->settings.locale();
 	this->changeLanguage(defaultLocale.toString());