Hello @Jason Selby ,
There is not an option to alter the default line spacing in the editor, however to do a single line break the editor follows the industry standard for Soft Break (Shift+Enter) as a keyboard shortcut to allow dropping single spacing line breaks vs standard double line break to issue a new paragraph used when pressing enter alone for a Full Break.
If this is something you would like to see I would recomend providing this feed back on the following Feature requests that our Jira Service Desk Development teams put together to collect feedback on the new editor, one is for the externally visible customer portal and the other for the internal user view:
This is absolutely annoying. Comments in Jira can get very, very long and having it auto double space can make them twice as long and twice as hard to sort through. Microsoft Word give the option to set up No Spacing when creating a document. That should also be on option on Jira and Confluence.
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