diff --git a/electrum/gui/kivy/main_window.py b/electrum/gui/kivy/main_window.py
index 38e3eff98..892d6ffa3 100644
--- a/electrum/gui/kivy/main_window.py
+++ b/electrum/gui/kivy/main_window.py
@@ -1119,7 +1119,7 @@ class ElectrumWindow(App, Logger, EventListener):
             arrow_pos=arrow_pos)
 
     @scheduled_in_gui_thread
-    def show_info_bubble(self, text=_('Hello World'), pos=None, duration=0,
+    def show_info_bubble(self, text=None, pos=None, duration=0,
                          arrow_pos='bottom_mid', width=None, icon='', modal=False, exit=False):
         '''Method to show an Information Bubble
 
@@ -1130,6 +1130,8 @@ class ElectrumWindow(App, Logger, EventListener):
             width: width of the Bubble
             arrow_pos: arrow position for the bubble
         '''
+        if text is None:
+            text = _('Hello World')
         text = str(text)  # so that we also handle e.g. Exception
         info_bubble = self.info_bubble
         if not info_bubble:
diff --git a/electrum/gui/qt/main_window.py b/electrum/gui/qt/main_window.py
index 89a3f87ef..a67420ce2 100644
--- a/electrum/gui/qt/main_window.py
+++ b/electrum/gui/qt/main_window.py
@@ -1294,8 +1294,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
         else:
             self.show_message(message)
 
-    def query_choice(self, msg, choices, title=_('Question'), default_choice=None):
+    def query_choice(self, msg, choices, title=None, default_choice=None):
         # Needed by QtHandler for hardware wallets
+        if title is None:
+            title = _('Question')
         dialog = WindowModalDialog(self.top_level_window(), title=title)
         dialog.setMinimumWidth(400)
         clayout = ChoicesLayout(msg, choices, checked_index=default_choice)
@@ -1918,10 +1920,12 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
         d = SeedDialog(self, seed, passphrase, config=self.config)
         d.exec_()
 
-    def show_qrcode(self, data, title = _("QR code"), parent=None, *,
+    def show_qrcode(self, data, title=None, parent=None, *,
                     help_text=None, show_copy_text_btn=False):
         if not data:
             return
+        if title is None:
+            title = _("QR code")
         d = QRDialog(
             data=data,
             parent=parent or self,