diff --git a/tests/test_gtk.py b/tests/test_gtk.py
index d7ba0d6..82be6b0 100644
--- a/tests/test_gtk.py
+++ b/tests/test_gtk.py
@@ -44,11 +44,21 @@ class TestApplication(unittest.TestCase):
         mock_cmd.get_arguments.assert_called()
         mock_activate.assert_called()
         self.assertEqual(self.application.runid, 0)
+        self.assertFalse(self.application.show_sidebar)
         self.assertIsNone(self.application.environment)
         self.assertIsNone(self.application.properties)
         self.assertIsNone(self.application.model)
         self.assertIsNone(self.application.summary)
 
+        mock_command_line.reset_mock()
+        mock_activate.reset_mock()
+        mock_cmd.reset_mock()
+        mock_cmd.get_arguments.return_value = ["show-sidebar"]
+
+        self.application.do_command_line(mock_cmd)
+        self.assertTrue(self.application.show_sidebar)
+
+        self.application.show_sidebar = False
         mock_command_line.reset_mock()
         mock_activate.reset_mock()
         mock_cmd.reset_mock()
@@ -68,6 +78,7 @@ class TestApplication(unittest.TestCase):
         self.assertEqual(self.application.environment,
                          self.application.properties.environment)
         self.assertEqual(self.application.model.runid, 42)
+        self.assertFalse(self.application.show_sidebar)
 
     @unittest.mock.patch("xfstestsdb.gtk.gsetup.add_style")
     @unittest.mock.patch("gi.repository.Adw.Application.add_window")
@@ -93,6 +104,9 @@ class TestApplication(unittest.TestCase):
         self.application.runid = 42
         self.assertEqual(self.application.win.runid, 42)
 
+        self.application.show_sidebar = True
+        self.assertTrue(self.application.win.show_sidebar)
+
         properties = xfstestsdb.gtk.model.PropertyList(self.xfstestsdb.sql, 42)
         self.application.properties = properties
         self.assertEqual(self.application.view.properties, properties)
@@ -150,11 +164,9 @@ class TestGtk(unittest.TestCase):
     def test_gtk_empty(self, mock_app: unittest.mock.Mock,
                        mock_stderr: unittest.mock.Mock):
         """Check that running `xfstestsdb gtk` without a runid."""
-        with self.assertRaises(SystemExit):
-            self.xfstestsdb.run(["gtk"])
-
-        self.assertRegex(mock_stderr.getvalue(),
-                         "error: the following arguments are required: runid")
+        self.xfstestsdb.run(["gtk"])
+        mock_app.assert_called_with(self.xfstestsdb.sql)
+        mock_app.return_value.run.assert_called_with(["show-sidebar"])
 
     @unittest.mock.patch("sys.stdout", new_callable=io.StringIO)
     @unittest.mock.patch("xfstestsdb.gtk.Application")
diff --git a/xfstestsdb/gtk/__init__.py b/xfstestsdb/gtk/__init__.py
index afc09c8..4261a17 100644
--- a/xfstestsdb/gtk/__init__.py
+++ b/xfstestsdb/gtk/__init__.py
@@ -18,6 +18,7 @@ class Application(Adw.Application):
     """Our Adw.Application for displaying xfstests results."""
 
     runid = GObject.Property(type=int)
+    show_sidebar = GObject.Property(type=bool, default=False)
     environment = GObject.Property(type=Gio.ListStore)
     properties = GObject.Property(type=model.PropertyList)
     summary = GObject.Property(type=model.SummaryList)
@@ -46,6 +47,8 @@ class Application(Adw.Application):
                     self.environment = self.properties.environment
                     self.model = model.TestCaseList(self.sql, self.runid)
                     self.summary = model.SummaryList(self.sql, self.runid)
+                case "show-sidebar":
+                    self.show_sidebar = True
 
         self.activate()
         return 0
@@ -60,6 +63,7 @@ class Application(Adw.Application):
         self.win.headerbar.pack_end(self.view.filterbuttons)
 
         self.bind_property("runid", self.win, "runid")
+        self.bind_property("show-sidebar", self.win, "show-sidebar")
         self.bind_property("environment", self.view, "environment")
         self.bind_property("properties", self.view, "properties")
         self.bind_property("model", self.view, "model")
@@ -83,19 +87,22 @@ class Command(commands.Command):
                  sql: sqlite.Connection) -> None:
         """Set up the gtk command."""
         super().__init__(subparser, sql, "gtk", help="show a gtk-based ui")
-        self.parser.add_argument("runid", metavar="runid", nargs=1, type=int,
+        self.parser.add_argument("runid", metavar="runid", nargs='?', type=int,
                                  help="show a specific xfstests run")
 
     def do_command(self, args: argparse.Namespace) -> None:
         """Run the Gtk UI."""
         app_args = []
 
-        if self.sql("SELECT 1 FROM xfstests_runs WHERE runid=?",
-                    args.runid[0]).fetchone():
-            app_args.append(f"runid={args.runid[0]}")
+        if args.runid is not None:
+            if self.sql("SELECT 1 FROM xfstests_runs WHERE runid=?",
+                        args.runid).fetchone():
+                app_args.append(f"runid={args.runid}")
+            else:
+                print(f"error: run #{args.runid} does not exist",
+                      file=sys.stderr)
+                sys.exit(errno.ENOENT)
         else:
-            print(f"error: run #{args.runid[0]} does not exist",
-                  file=sys.stderr)
-            sys.exit(errno.ENOENT)
+            app_args.append("show-sidebar")
 
         Application(self.sql).run(app_args)