diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -494,6 +494,8 @@ void MainWindow::showSecondary(QWidget* 
 
     secondaryPlot = wid;
     ui->splitter->addWidget(wid);
+    ui->splitter->setStretchFactor(0, 1);
+    ui->splitter->setStretchFactor(1, 0);
 }
 
 void MainWindow::hideSecondary()