odoo-survey-addons/survey_select_input/views/survey_survey.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="survey_survey_view_form" model="ir.ui.view">
    <field name="name">survey_select_input survey.survey form</field>
    <field name="model">survey.survey</field>
    <field name="inherit_id" ref="survey.survey_survey_view_form" />
    <field name="priority">26</field>
    <field name="arch" type="xml">
      <xpath expr="//div[@name='button_box']" position="inside">
        <button type="object" name="action_survey_user_input"
          attrs="{'invisible': [('answer_selection','=',False)]}"
          context="{'search_default_selected':1}"
          class="oe_stat_button text-success" icon="fa-check-circle">
          <field name="answer_selected_count" string="Selected" widget="statinfo" />
        </button>
        <button type="object" name="action_survey_user_input"
          attrs="{'invisible': [('answer_selection','=',False)]}"
          context="{'search_default_selected':1}"
          class="oe_stat_button text-success">
          <field name="answer_selected_ratio" string="Selected" widget="percentpie" />
        </button>
      </xpath>
      <group name="participants" position="attributes">
        <attribute name="class">o_label_nowrap</attribute>
      </group>
      <group name="participants" position="inside">
        <field name="answer_selection" />
      </group>
    </field>
  </record>

</odoo>