The profile editor uses a rich text editor with full formatting support. You can write and edit directly in the editor, use formatting controls for structure, or switch to source view if you want to work with the raw markdown directly.
Source view is useful when you want to make changes that span multiple sections at once, paste in large blocks of example text, or write custom rules that the standard editor doesn't accommodate cleanly. Both views save to the same document — switching to source view reflects the current state of the profile either way.