close all other windows on closeEvent of Main Window

sohstationviewer/view/main_window.py

@@ -680,6 +680,10 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
             self.data_loader.thread.quit()
             self.data_loader.thread.wait()
 
+        # close all remaining windows
+        for window in QtWidgets.QApplication.topLevelWidgets():
+            window.close()
+
     def delete_old_temp_data_folder(self) -> None:
         """
         Delete temp_data_folder which is used for keeping memmap files in case