You can hide an image on mobile views by following these steps: 


1. Open Campaign

 

2. Navigate to Editor tab 


3. Select Friend Share Email view


4. Switch to the HTML & CSS tab


 

5. Find the following piece of code: 


<tr>

       <td>              

              <img alt="{{ site_setup.name }}" width="480" src="{{ "friend_share_email_background" | localize: "tkbl_default_advocate-email-background-v2.jpg", trait: "asset" }}" class="email-background"/>            

       </td>         

 </tr>  




6. Remove it or comment it out 


7. Save changes