How can I remove this Requested for in Service Item

Hi,

Unfortunately, this is not possible with out of the box configuration.
You can fix this with some custom CSS in the portal rebranding:

We have the following live in our instance, under "Custom Stylesheet”:

fieldset.default_requester {
   display: none !important;
}

#ticket-field-52000061188 {
   display: none !important;
}

.requester-email
{
    display: none !important; 
}