root/data/resources/ui/settings.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <template class="SettingsPage" parent="GtkBox">
    <property name="orientation">vertical</property>

    <child>
      <object class="AdwHeaderBar">

        <child type="start">
          <object class="GtkButton" id="back_button">
            <property name="icon-name">go-previous-symbolic</property>
            <property name="tooltip-text" translatable="true">Go to Browse Page</property>
            <property name="action-name">app.open-browse</property>
          </object>
        </child>

        <property name="title-widget">
          <object class="GtkLabel">
            <property name="label" translatable="yes">Boorus</property>
          </object>
        </property>
      </object>
    </child>

    <child>
      <object class="GtkScrolledWindow" id="window">
        <property name="hscrollbar-policy">automatic</property>
        <property name="vscrollbar-policy">automatic</property>
        <property name="hexpand">True</property>
        <property name="vexpand">True</property>
        <property name="width-request">240</property>

        <child>
          <object class="AdwPreferencesPage">

            <child>
              <object class="AdwPreferencesGroup" id="existing_boorus">
                <property name="title" translatable="yes">Added Boorus</property>
              </object>
            </child>

            <child>
              <object class="AdwPreferencesGroup">
                <property name="title" translatable="yes">Add New Booru Site</property>
                <child>
                  <object class="AdwEntryRow" id="url_entry">
                    <property name="title" translatable="yes">Domain (e.g.: safebooru.org)</property>
                  </object>
                </child>

                <child>
                  <object class="AdwButtonRow" id="add_button">
                    <property name="title" translatable="yes">Add</property>
                    <style>
                      <class name="suggested-action"/>
                    </style>
                  </object>
                </child>

              </object>
            </child>

            <child>
              <object class="AdwPreferencesGroup">
                <property name="margin-top">40</property>
                <child>
                  <object class="AdwButtonRow" id="done_button">
                    <property name="title" translatable="yes">Done</property>
                    <property name="action-name">app.open-browse</property>
                    <style>
                      <class name="suggested-action"/>
                    </style>
                  </object>
                </child>
              </object>
            </child>

          </object>
        </child>

      </object>
    </child>

  </template>
</interface>