diff --git a/frontend/ui/widget/buttonprogresswidget.lua b/frontend/ui/widget/buttonprogresswidget.lua
index 739f62caa..6adb7b3b2 100644
--- a/frontend/ui/widget/buttonprogresswidget.lua
+++ b/frontend/ui/widget/buttonprogresswidget.lua
@@ -19,6 +19,7 @@ local ButtonProgressWidget = InputContainer:new{
     enabled = true,
     num_buttons = 2,
     position = 1,
+    default_position = nil,
     thin_grey_style = false, -- default to black
 }
 
@@ -47,18 +48,24 @@ function ButtonProgressWidget:update()
     local button_width = math.floor(self.width / self.num_buttons) - 2*button_padding - 2*button_margin - 2*button_bordersize
     for i = 1, self.num_buttons do
         local highlighted = i <= self.position
+        local is_default = i == self.default_position
         local margin = button_margin
         if self.thin_grey_style and highlighted then
             margin = 0 -- moved outside button so it's not inverted
         end
+        local extra_border_size = 0
+        if not self.thin_grey_style and is_default then
+            -- make the border a bit bigger on the default button
+            extra_border_size = Size.border.thin
+        end
         local button = Button:new{
             text = "",
             radius = 0,
             margin = margin,
             padding = button_padding,
-            bordersize = button_bordersize,
+            bordersize = button_bordersize + extra_border_size,
             enabled = true,
-            width = button_width,
+            width = button_width - 2*extra_border_size,
             preselect = highlighted,
             text_font_face = self.font_face,
             text_font_size = self.font_size,
@@ -73,7 +80,14 @@ function ButtonProgressWidget:update()
             end,
         }
         if self.thin_grey_style then
-            button.frame.color = Blitbuffer.COLOR_DARK_GRAY -- no black border around gray squares
+            if is_default then
+                -- use a black border as a discreet visual hint
+                button.frame.color = Blitbuffer.COLOR_BLACK
+            else
+                -- otherwise, gray border, same as the filled
+                -- button, so looking as if no border
+                button.frame.color = Blitbuffer.COLOR_DARK_GRAY
+            end
             if highlighted then
                 -- The button and its frame background will be inverted,
                 -- so invert the color we want so it gets inverted back
@@ -94,8 +108,9 @@ function ButtonProgressWidget:update()
     end)
 end
 
-function ButtonProgressWidget:setPosition(position)
+function ButtonProgressWidget:setPosition(position, default_position)
     self.position = position
+    self.default_position = default_position
     self:update()
 end
 
diff --git a/frontend/ui/widget/configdialog.lua b/frontend/ui/widget/configdialog.lua
index ceeb086f2..9af8fd4be 100644
--- a/frontend/ui/widget/configdialog.lua
+++ b/frontend/ui/widget/configdialog.lua
@@ -302,8 +302,9 @@ function ConfigOption:init()
                 option_items_fixed = true
             end
 
-            -- Find out currently selected item
+            -- Find out currently selected and default items indexes
             local current_item = nil
+            local default_item = self.options[c].default_pos
             local function value_diff(val1, val2, name)
                 if type(val1) ~= type(val2) then
                     logger.dbg("different data types in option")
@@ -353,6 +354,34 @@ function ConfigOption:init()
                         end
                     end
                 end
+                local default_option_name = self.config.config_options.prefix.."_"..self.options[c].name
+                local default_value = G_reader_settings:readSetting(default_option_name)
+                if default_value then
+                    local val = default_value
+                    local min_diff
+                    if type(val) == "table" then
+                        min_diff = value_diff(val[1], self.options[c].values[1][1])
+                    else
+                        min_diff = value_diff(val, self.options[c].values[1])
+                    end
+
+                    local diff
+                    for index, val_ in pairs(self.options[c].values) do
+                        if type(val) == "table" then
+                            diff = value_diff(val[1], val_[1])
+                        else
+                            diff = value_diff(val, val_)
+                        end
+                        if val == val_ then
+                            default_item = index
+                            break
+                        end
+                        if diff <= min_diff then
+                            min_diff = diff
+                            default_item = index
+                        end
+                    end
+                end
             end
 
             -- Deal with the various kind of config widgets
@@ -523,8 +552,7 @@ function ConfigOption:init()
                     show_parrent = self.config,
                     enabled = enabled,
                 }
-                local position = current_item
-                switch:setPosition(position)
+                switch:setPosition(current_item, default_item)
                 table.insert(option_items_group, switch)
             end
 
@@ -891,6 +919,10 @@ function ConfigDialog:onMakeDefault(name, name_text, values, labels, position)
         ok_callback = function()
             name = self.config_options.prefix.."_"..name
             G_reader_settings:saveSetting(name, values[position])
+            self:update()
+            UIManager:setDirty(self, function()
+                return "ui", self.dialog_frame.dimen
+            end)
         end,
     })
 end