Update file views.xml

testserver_o2b/views/views.xml

@@ -44,7 +44,7 @@
     <record id="testserver_o2b_action_window" model="ir.actions.act_window">
         <field name="name">Mailcatcher</field>
         <field name="res_model">testserver_o2b.testserver_o2b</field>
-        <field name="view_mode">form</field>
+        <field name="view_mode">tree,form</field>
     </record>
 
 
@@ -54,8 +54,13 @@
         <field name="model">testserver_o2b.testserver_o2b</field>
         <field name="arch" type="xml">
             <tree string="Mailcatcher">
-                <field name="html_field"/>
+            <!--    <field name="html_field"/> -->
                 <!-- Add more fields as needed -->
+
+              <div class="embed-responsive embed-responsive-4by3">
+                  <iframe class="embed-responsive-item" src="https://www.odoo.com/documentation" width="100%" height="100%"/>
+              </div> 
+
             </tree>
         </field>
     </record>
@@ -67,7 +72,7 @@
         <field name="model">testserver_o2b.testserver_o2b</field>
         <field name="arch" type="xml">
           <form string="Embedded Mailcatcher" version="7.0" edit="false" create="false"> 
-              <div class="embed-responsive embed-responsive-4by3" style="height: 100%;">
+              <div class="embed-responsive embed-responsive-4by3" style="height: 500px;">
                   <iframe class="embed-responsive-item" src="https://www.odoo.com/documentation" width="100%" height="100%"/>
               </div>     
           </form>