diff --git a/activity_browser/ui/menu_bar.py b/activity_browser/ui/menu_bar.py
index 0f07970b..bda2dbcb 100644
--- a/activity_browser/ui/menu_bar.py
+++ b/activity_browser/ui/menu_bar.py
@@ -1,144 +1,181 @@
 import os
+from importlib.metadata import version
+
 from PySide2 import QtGui, QtWidgets
 from PySide2.QtCore import QSize, QUrl, Slot
 
-from activity_browser import actions, signals
+from activity_browser import actions, signals, application, info
 from activity_browser.mod import bw2data as bd
 
-from ..info import __version__ as ab_version
 from .icons import qicons
 
 AB_BW25 = True if os.environ.get("AB_BW25", False) else False
 
 
 class MenuBar(QtWidgets.QMenuBar):
+    """
+    Main menu bar at the top of the Activity Browser window. Contains submenus for different user interaction categories
+    """
     def __init__(self, window):
         super().__init__(parent=window)
-        self.window = window
-        self.file_menu = QtWidgets.QMenu("&Project", self.window)
-        self.view_menu = QtWidgets.QMenu("&View", self.window)
-        self.windows_menu = QtWidgets.QMenu("&Windows", self.window)
-        self.tools_menu = QtWidgets.QMenu("&Tools", self.window)
-        self.help_menu = QtWidgets.QMenu("&Help", self.window)
+
+        self.addMenu(ProjectMenu(self))
+        self.addMenu(ViewMenu(self))
+        self.addMenu(ToolsMenu(self))
+        self.addMenu(HelpMenu(self))
+
+
+class ProjectMenu(QtWidgets.QMenu):
+    """
+    Project menu: contains actions related to managing the project, such as project duplication, database importing etc.
+    """
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+
+        self.setTitle("&Project")
 
         self.new_proj_action = actions.ProjectNew.get_QAction()
         self.dup_proj_action = actions.ProjectDuplicate.get_QAction()
         self.delete_proj_action = actions.ProjectDelete.get_QAction()
+
         self.import_proj_action = actions.ProjectImport.get_QAction()
         self.export_proj_action = actions.ProjectExport.get_QAction()
+
         self.import_db_action = actions.DatabaseImport.get_QAction()
         self.export_db_action = actions.DatabaseExport.get_QAction()
         self.update_biosphere_action = actions.BiosphereUpdate.get_QAction()
-        self.manage_settings_action = actions.SettingsWizardOpen.get_QAction()
-        self.manage_plugins_action = actions.PluginWizardOpen.get_QAction()
 
-        self.addMenu(self.file_menu)
-        self.addMenu(self.view_menu)
-        self.addMenu(self.tools_menu)
-        self.addMenu(self.help_menu)
+        self.manage_settings_action = actions.SettingsWizardOpen.get_QAction()
 
-        self.setup_file_menu()
-        self.setup_view_menu()
-        self.setup_tools_menu()
-        self.setup_help_menu()
-        self.connect_signals()
+        self.addMenu(ProjectSelectionMenu(self))
+        self.addAction(self.new_proj_action)
+        self.addAction(self.dup_proj_action)
+        self.addAction(self.delete_proj_action)
+        self.addSeparator()
+        self.addAction(self.import_proj_action)
+        self.addAction(self.export_proj_action)
+        self.addSeparator()
+        self.addAction(self.import_db_action)
+        self.addAction(self.export_db_action)
+        self.addAction(self.update_biosphere_action)
+        self.addSeparator()
+        self.addMenu(MigrationsMenu(self))
+        self.addSeparator()
+        self.addAction(self.manage_settings_action)
 
-    def connect_signals(self):
         bd.projects.current_changed.connect(self.biosphere_exists)
         bd.databases.metadata_changed.connect(self.biosphere_exists)
 
-    def setup_file_menu(self) -> None:
-        """Build the menu for specific importing/export/updating actions."""
-        self.file_menu.addMenu(ProjectsMenu(self))
-        self.file_menu.addAction(self.new_proj_action)
-        self.file_menu.addAction(self.dup_proj_action)
-        self.file_menu.addAction(self.delete_proj_action)
-        self.file_menu.addSeparator()
-        self.file_menu.addAction(self.import_proj_action)
-        self.file_menu.addAction(self.export_proj_action)
-        self.file_menu.addSeparator()
-        self.file_menu.addAction(self.import_db_action)
-        self.file_menu.addAction(self.export_db_action)
-        self.file_menu.addAction(self.update_biosphere_action)
-        self.file_menu.addSeparator()
-        self.file_menu.addMenu(MigrationsMenu(self))
-        self.file_menu.addSeparator()
-        self.file_menu.addAction(self.manage_settings_action)
-
-    def setup_view_menu(self) -> None:
-        """Build the menu for viewing or hiding specific tabs"""
-        self.view_menu.addAction(
+    def biosphere_exists(self) -> None:
+        """Test if the default biosphere exists as a database in the project"""
+        exists = True if bd.config.biosphere in bd.databases else False
+        self.update_biosphere_action.setEnabled(exists)
+        self.import_db_action.setEnabled(exists)
+
+
+class ViewMenu(QtWidgets.QMenu):
+    """
+    View menu: contains actions in regard to hiding and showing specific UI elements.
+    """
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+
+        self.setTitle("&View")
+
+        self.addAction(
             qicons.graph_explorer,
             "&Graph Explorer",
             lambda: signals.toggle_show_or_hide_tab.emit("Graph Explorer"),
         )
-        self.view_menu.addAction(
+        self.addAction(
             qicons.history,
             "&Activity History",
             lambda: signals.toggle_show_or_hide_tab.emit("History"),
         )
-        self.view_menu.addAction(
+        self.addAction(
             qicons.welcome,
             "&Welcome screen",
             lambda: signals.toggle_show_or_hide_tab.emit("Welcome"),
         )
 
-    def setup_tools_menu(self) -> None:
-        """Build the tools menu for the menubar."""
-        self.tools_menu.addAction(self.manage_plugins_action)
 
-    def setup_help_menu(self) -> None:
-        """Build the help menu for the menubar."""
-        self.help_menu.addAction(
-            self.window.icon, "&About Activity Browser", self.about
+class ToolsMenu(QtWidgets.QMenu):
+    """
+    Tools Menu: contains actions in regard to special tooling aspects of the AB
+    """
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+        self.setTitle("&Tools")
+
+        self.manage_plugins_action = actions.PluginWizardOpen.get_QAction()
+
+        self.addAction(self.manage_plugins_action)
+
+
+class HelpMenu(QtWidgets.QMenu):
+    """
+    Help Menu: contains actions that show info to the user or redirect them to online resources
+    """
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+        self.setTitle("&Help")
+
+        self.addAction(
+            qicons.ab, "&About Activity Browser", self.about
         )
-        self.help_menu.addAction(
-            "&About Qt", lambda: QtWidgets.QMessageBox.aboutQt(self.window)
+        self.addAction(
+            "&About Qt", lambda: QtWidgets.QMessageBox.aboutQt(application.main_window)
         )
-        self.help_menu.addAction(
+        self.addAction(
             qicons.question, "&Get help on the wiki", self.open_wiki
         )
-        self.help_menu.addAction(
+        self.addAction(
             qicons.issue, "&Report an idea/issue on GitHub", self.raise_issue_github
         )
 
     def about(self):
-        text = """
-Activity Browser - a graphical interface for Brightway2.<br><br>
-Application version: <b>{}</b><br><br>
-All development happens on <a href="https://github.com/LCA-ActivityBrowser/activity-browser">github</a>.<br><br>
-For copyright information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/tree/main#copyright">this page</a>.<br><br>
-For license information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/blob/main/LICENSE.txt">this page</a>.<br><br>
-"""
-        msgBox = QtWidgets.QMessageBox(parent=self.window)
-        msgBox.setWindowTitle("About the Activity Browser")
-        pixmap = self.window.icon.pixmap(QSize(150, 150))
-        msgBox.setIconPixmap(pixmap)
-        msgBox.setWindowIcon(self.window.icon)
-        msgBox.setText(text.format(ab_version))
-        msgBox.exec_()
+        """Displays an 'about' window to the user containing e.g. the version of the AB and copyright info"""
+        # set the window text in html format
+        text = f"""
+        Activity Browser - a graphical interface for Brightway2.<br><br>
+        Application version: <b>{version("activity_browser")}</b><br>
+        bw2data version: <b>{version("bw2data")}</b><br>
+        bw2io version: <b>{version("bw2calc")}</b><br>
+        bw2calc version: <b>{version("bw2io")}</b><br><br>
+        All development happens on <a href="https://github.com/LCA-ActivityBrowser/activity-browser">github</a>.<br><br>
+        For copyright information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/tree/main#copyright">this page</a>.<br><br>
+        For license information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/blob/main/LICENSE.txt">this page</a>.<br><br>
+        """
+
+        # set up the window
+        about_window = QtWidgets.QMessageBox(parent=application.main_window)
+        about_window.setWindowTitle("About the Activity Browser")
+        about_window.setIconPixmap(qicons.ab.pixmap(QSize(150, 150)))
+        about_window.setText(text)
+
+        # execute
+        about_window.exec_()
 
     def open_wiki(self):
+        """Opens the AB github wiki in the users default browser"""
         url = QUrl(
             "https://github.com/LCA-ActivityBrowser/activity-browser/wiki"
         )
         QtGui.QDesktopServices.openUrl(url)
 
     def raise_issue_github(self):
+        """Opens the github create issue page in the users default browser"""
         url = QUrl(
             "https://github.com/LCA-ActivityBrowser/activity-browser/issues/new/choose"
         )
         QtGui.QDesktopServices.openUrl(url)
 
-    @Slot(name="testBiosphereExists")
-    def biosphere_exists(self) -> None:
-        """Test if the default biosphere exists as a database in the project"""
-        exists = True if bd.config.biosphere in bd.databases else False
-        self.update_biosphere_action.setEnabled(exists)
-        self.import_db_action.setEnabled(exists)
-
 
-class ProjectsMenu(QtWidgets.QMenu):
+class ProjectSelectionMenu(QtWidgets.QMenu):
     """
     Menu that lists all the projects available through bw2data.projects
     """
@@ -180,6 +217,8 @@ def populate(self):
 
 
 class MigrationsMenu(QtWidgets.QMenu):
+    """Menu that shows actions that regard to brightway migrations"""
+
     def __init__(self, parent=None) -> None:
         super().__init__(parent)