diff --git a/cpdctrl_gui/ui/main_window.py b/cpdctrl_gui/ui/main_window.py
index 849a937..46140f3 100644
--- a/cpdctrl_gui/ui/main_window.py
+++ b/cpdctrl_gui/ui/main_window.py
@@ -11,6 +11,7 @@ from .widgets.menubar import MenuBar
 from .widgets.toolbar import ToolBar
 from .widgets.metadata_input import MetadataInput
 from .widgets.measurement_settings import MeasurementSettings, ScriptSelection
+from .widgets.app_settings import AppSettings
 from .widgets.plot import Plot
 from .widgets.device_select import ListChoice
 from .widgets.about import MarkdownView
@@ -129,6 +130,7 @@ class MainWindow(QMainWindow):
         self.topbar.add_button("meas_stop", "Stop", QIcon.fromTheme(QIcon.ThemeIcon.MediaPlaybackStop), self.measure_stop)
         self.topbar.add_button("meas_save", "Save", QIcon.fromTheme(QIcon.ThemeIcon.DocumentSaveAs), self.measurement_save)
         self.topbar.add_separator()
+        self.topbar.add_button("app_settings", "Settings", QIcon.fromTheme(QIcon.ThemeIcon.DocumentProperties), self.app_open_settings)
         self.topbar.addAction(self.a_open_help)
         self.topbar.addAction(self.a_open_about)
         self.topbar.add_button("app_exit", "Exit", QIcon.fromTheme(QIcon.ThemeIcon.ApplicationExit), self.app_exit)
@@ -368,8 +370,19 @@ class MainWindow(QMainWindow):
         buttons.accepted.connect(dialog.accept)
         dialog.setLayout(QVBoxLayout())
         # show help.md
-        dialog.layout().addWidget(MarkdownView("troubleshooting.md"))
+        #dialog.layout().addWidget(MarkdownView("troubleshooting.md"))
+        dialog.layout().addWidget(MarkdownView("user_guide.md"))
         dialog.layout().addWidget(buttons)
+        # set larger window size
+        dialog.resize(800, 600)
+        dialog.exec()
+
+    def app_open_settings(self) -> None:
+        dialog = QDialog()
+        w_settings = AppSettings()
+        layout = QVBoxLayout()
+        layout.addWidget(w_settings)
+        dialog.setLayout(layout)
         dialog.exec()
 
     def closeEvent(self, event):
diff --git a/cpdctrl_gui/ui/widgets/app_settings.py b/cpdctrl_gui/ui/widgets/app_settings.py
new file mode 100644
index 0000000..d120b66
--- /dev/null
+++ b/cpdctrl_gui/ui/widgets/app_settings.py
@@ -0,0 +1,9 @@
+from PyQt6.QtWidgets import QWidget, QVBoxLayout, QFormLayout
+
+from ...utility.config import AppConfig
+
+class AppSettings(QWidget):
+    def __init__(self):
+        super().__init__()
+        self.setLayout(QVBoxLayout())
+        self.l_form = QFormLayout()