diff --git a/components/charts/heatmap.hh b/components/charts/heatmap.hh
index 574aae9..ff08f10 100644
--- a/components/charts/heatmap.hh
+++ b/components/charts/heatmap.hh
@@ -55,8 +55,7 @@ private:
     QSize get_matrix_size();
   private:
     friend class Impl;
-    // QSize matrix_size = {3, 4};
-    QSize matrix_size;
+    QSize matrix_size = {3, 4};
 };
 } // namespace plot_widget::internal
 
diff --git a/components/view.cc b/components/view.cc
index 26b404d..41e1028 100644
--- a/components/view.cc
+++ b/components/view.cc
@@ -3,6 +3,7 @@
 //
 
 #include <qsize.h>
+#include <qsizepolicy.h>
 #include <random>
 
 #include "component.hh"
@@ -38,7 +39,7 @@ static auto ComConfigComponent(ThemeManager& manager, auto&& callback) {
     slogen_context->set_silent("BanG Bream! It's MyGo!!!");
     
     auto select_com_context = std::make_shared<MutableValue<QStringList>>();
-    select_com_context->set_silent(QStringList {});
+    select_com_context->set_silent(QStringList {"COM1", "COM2", "COM3", "COM4", "COM5"});
 
     auto select_baud_context = std::make_shared<MutableValue<QStringList>>();
     select_baud_context->set_silent(QStringList {"9600", "115200"});
@@ -57,6 +58,10 @@ static auto ComConfigComponent(ThemeManager& manager, auto&& callback) {
             slpro::LeadingIcon {material::icon::kArrowDropDown, material::regular::font},
             slpro::IndexChanged {[&](auto& self){ qDebug() << self.currentIndex();}},
             slpro::LeadingText {"COM"},
+            MutableForward {
+                slpro::SelectItems {},
+                select_com_context,
+            }
         },
         lnpro::Item<MatSelect> {
             slpro::ThemeManager {manager },
@@ -145,6 +150,9 @@ static auto ComConfigComponent(ThemeManager& manager, auto&& callback) {
 static auto DisplayComponent(ThemeManager& manager, int index = 0) noexcept {
     const auto row = new Row{
             lnpro::Item<HeatMapPlot> {
+                plot_widget::pro::SizePolicy {
+                    QSizePolicy::Expanding,
+                },
                 pwpro::MatrixSize {
                     QSize{3, 4}
                 },
@@ -190,8 +198,13 @@ auto ViewComponent(ViewComponentState& state) noexcept -> raw_pointer<QWidget> {
                     }),
             },
             
-            lnpro::Item {
-            DisplayComponent(state.manager),
+            lnpro::Item<Row> {
+                lnpro::Item {
+                    DisplayComponent(state.manager),
+                },
+                lnpro::Item {
+                    DisplayComponent(state.manager),
+                },
             },
         },
     };
diff --git a/main.cc b/main.cc
index 48e8aab..39b00c4 100644
--- a/main.cc
+++ b/main.cc
@@ -1,4 +1,5 @@
 #include "component.hh"
+#include "modern-qt/utility/material-icon.hh"
 #include <qstandardpaths.h>
 #include <modern-qt/core/application.hh>
 #include <modern-qt/layout/linear.hh>
@@ -32,7 +33,7 @@ auto main(int argc, char *argv[]) -> int {
 
         },
         .buttons_context = {
-            {"0", material::icon::kHome},
+            {"0", material::icon::kTouchSensor},
             {"1", material::icon::kStar},
             {"2", material::icon::kFavorite},
             {"3", material::icon::kExtension},
diff --git a/modern-qt/utility/material-icon.hh b/modern-qt/utility/material-icon.hh
index d41e8a4..d50eee2 100644
--- a/modern-qt/utility/material-icon.hh
+++ b/modern-qt/utility/material-icon.hh
@@ -161,6 +161,9 @@ namespace material {
         // link
         constexpr auto kAddLink = "add_link";
         constexpr auto kLinkOff = "link_off";
+
+        // sensor icon
+        constexpr auto kTouchSensor = "touch_app";
     }
 }
 }