My_GtkUi/Gtk4_Reset/res/game1.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <requires lib="gtk" version="4.0"/>
  <!-- <object class="GtkWindow" id="window"> -->
  <template class="GameApp" parent="GtkWindow">
    <property name="title" translatable="1">Guess Game</property>
    <property name="destroy-with-parent">1</property>
    <property name="child">
      <object class="GtkGrid">
      <property name="visible">1</property>
        <child>
          <object class="GtkLabel" id="label">
            <property name="label" translatable="1">Select a button</property>
            <property name="visible">1</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="1">1</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="has-frame">0</property>
            <property name="visible">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="1">2</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="has-frame">0</property>
            <property name="visible">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="1">3</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="has-frame">0</property>
            <property name="visible">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="1">4</property>
            <property name="width-request">100</property>
            <property name="height-request">100</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="has-frame">0</property>
            <property name="visible">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="1">Go</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="visible">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="1">Exit</property>
            <property name="focusable">1</property>
            <property name="receives-default">1</property>
            <property name="visible">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="visible">1</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="visible">1</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="visible">1</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>
  <!-- </object> -->
</interface>