gnome-control-center/panels/microphone/cc-microphone-panel.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <template class="CcMicrophonePanel" parent="CcPanel">

    <child type="titlebar-end">
      <object class="GtkSwitch" id="main_switch">
        <property name="valign">center</property>
      </object>
    </child>

    <child type="content">
      <object class="GtkStack" id="stack">

        <child>
          <object class="GtkStackPage">
            <property name="name">empty</property>
            <property name="child">
              <object class="AdwStatusPage">
                <property name="icon-name">microphone-disabled-symbolic</property>
                <property name="title" translatable="yes">Microphone Turned Off</property>
                <property name="description" translatable="yes">No applications can record sound.</property>
              </object>
            </property>
          </object>
        </child>

        <child>
          <object class="GtkStackPage">
            <property name="name">content</property>
            <property name="child">
              <object class="AdwPreferencesPage">
                <child>
                  <object class="AdwPreferencesGroup">
                    <property name="description" translatable="yes">Use of the microphone allows applications to record and listen to audio. Disabling the microphone may cause some applications to not function properly.

Allow the applications below to use your microphone.</property>
                    <child>
                      <object class="GtkListBox" id="microphone_apps_list_box">
                        <property name="can-focus">true</property>
                        <property name="selection-mode">none</property>
                        <style>
                          <class name="boxed-list"/>
                        </style>

                        <child type="placeholder">
                          <object class="GtkLabel">
                            <property name="margin-top">18</property>
                            <property name="margin-bottom">18</property>
                            <property name="margin-start">18</property>
                            <property name="margin-end">18</property>
                            <property name="label" translatable="yes">No Applications Have Asked for Microphone Access</property>
                            <property name="wrap">true</property>
                            <property name="max-width-chars">50</property>
                            <style>
                              <class name="dim-label" />
                            </style>
                          </object>
                        </child>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>

      </object>
    </child>
  </template>
</interface>