fix #4491

gui/kivy/main_window.py

@@ -68,7 +68,8 @@ Label.register('Roboto',
                'gui/kivy/data/fonts/Roboto-Bold.ttf')
 
 
-from electrum.util import base_units, NoDynamicFeeEstimates
+from electrum.util import (base_units, NoDynamicFeeEstimates, decimal_point_to_base_unit_name,
+                           base_unit_name_to_decimal_point)
 
 
 class ElectrumWindow(App):
@@ -159,11 +160,13 @@ class ElectrumWindow(App):
         self._trigger_update_history()
 
     def _get_bu(self):
-        return self.electrum_config.get('base_unit', 'mBTC')
+        decimal_point = self.electrum_config.get('decimal_point', 5)
+        return decimal_point_to_base_unit_name(decimal_point)
 
     def _set_bu(self, value):
         assert value in base_units.keys()
-        self.electrum_config.set_key('base_unit', value, True)
+        decimal_point = base_unit_name_to_decimal_point(value)
+        self.electrum_config.set_key('decimal_point', decimal_point, True)
         self._trigger_update_status()
         self._trigger_update_history()