Hey David,
first of all, thank you for the purchase and my apologies for the delayed reply – there has been a glitch in the forum’s new message reporting system.
Regarding your question: please try using the “Number of portfolio projects per page” option on the “One-page website” tab of the Theme Options panel to control the number of items shown on the one-page layout; the option you’ve mentioned is intended for the singular portfolio pages. The number of portfolio items per line is regulated by the “Number of portfolio items per line” option in the “Portfolio Page” tab of the Theme Options panel.
Should you still face problems with the above, please let me know!
Sincerely,
Andrii / Satori Studio