Send for Negotiation includes an Email Message field with a rich text editor that allows you to enter a custom message if no email template is selected, or make edits to your previously selected email template. By default, the rich text editor is available for you to use.If you don't want to allow any edits, you can disable this feature in the customs Settings by taking the following steps:

  1. In Salesforce, navigate to Custom Settings
  2. Conga General Settings.
  3. Check the Email Template Ready Only checkbox to disable the ability to edit the Email Message field. Uncheck it to allow edits.