Hi, There is user_id field in mail_activity model to show them in dashboard, I tried to visible it, so I gave syntax  as invisible="0" also tried with invisible="False" , but the field is invisible still. How to make a field visible in tree view. Can any one help me? I have mentioned the code below

<record id="report_sale_order_board_tree" model="ir.ui.view">
  <field name="name">report.sale.order.board.treefield>
  <field name="model">mail.activityfield>
  <field name="arch" type="xml">

    <tree string="Sales Orders" decoration-danger="date_deadline < current_date"
          decoration-success="date_deadline == current_date"
                default_order="date_deadline" create="false" edit="0">
          <field name="is_action" invisible="1"/>
        <field name="res_name"/>
            <field name="user_id" invisible="0"/>

        <field name="activity_type_id"/>
        <field name="summary"/>
        <field name="note"/>
        <field name="date_deadline"/>
        <field name="create_date"/>
        <field name="res_model"/>
    tree>
  field>
record>

                    

Thank you