Unable to modify the font, size, text for the deal registration approval notification

Summary:

we are unable to modify the font, or size for the deal registration notification. we have only a page layout where we can add/ remove fields. is there any option to modify it?

Content (required):

we are unable to modify the font, or size for the deal registration notification. we have only a page layout where we can add/ remove fields. is there any option to modify it?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):