Enable or Disable Author Remarks (PDF)
Author remarks are comments in code, where the comment is part of the topic, but not displayed to your end users. Author remarks have no relation to the feedback comments in reviews and are not part of the review "conversation".
Via the Layout Editor you can choose to include Author remarks in your PDF output.
Select General and choose Draft and Watermark in the sidebar.
Scroll down to Show Comments.
Select:
Enabled to include author remarks in PDF output.
Disabled to exclude author remarks in PDF output. Default

Note
You can show remarks (comments) with Draft mode set to Yes, Default, or No. The Draft mode setting has no effect on whether remarks are visible in the output.
