My_GtkUi/Gtk4/res/game1.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <requires lib="gtk" version="4.0"/>
  <template class="GameWin" parent="GtkWindow">
    <property name="can-focus">0</property>
    <property name="destroy-with-parent">1</property>
    <property name="child">
      <object class="GtkGrid">
        <property name="can-focus">0</property>
        <child>
          <object class="GtkLabel" id="label_status">
            <property name="can-focus">0</property>
            <property name="label" translatable="yes">Select a button</property>
            <layout>
              <property name="column">1</property>
              <property name="row">0</property>
              <property name="column-span">3</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_1">
            <property name="label" translatable="yes">1</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">1</property>
              <property name="row">2</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_2">
            <property name="label" translatable="yes">2</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">3</property>
              <property name="row">2</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_3">
            <property name="label" translatable="yes">3</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">1</property>
              <property name="row">4</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_4">
            <property name="label" translatable="yes">4</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">3</property>
              <property name="row">4</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_go">
            <property name="label" translatable="yes">Go</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">1</property>
              <property name="row">6</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkButton" id="btn_exit">
            <property name="label" translatable="yes">Exit</property>
            <property name="receives-default">1</property>
            <layout>
              <property name="column">3</property>
              <property name="row">6</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="width-request">20</property>
            <property name="height-request">20</property>
            <property name="can-focus">0</property>
            <layout>
              <property name="column">2</property>
              <property name="row">3</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="width-request">20</property>
            <property name="height-request">20</property>
            <property name="can-focus">0</property>
            <layout>
              <property name="column">2</property>
              <property name="row">5</property>
            </layout>
          </object>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="width-request">20</property>
            <property name="height-request">20</property>
            <property name="can-focus">0</property>
            <layout>
              <property name="column">2</property>
              <property name="row">1</property>
            </layout>
          </object>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
        <child>
          <placeholder/>
        </child>
      </object>
    </property>
  </template>
</interface>