Hey Chris,
the content width in Ikebana is determined by two parameters:
1. The “width” CSS statement which is generated by the code on lines 806-850 of the “header-functions.php” template file, depending on the width of the single portfolio masonry tile, so that a non-fractional number of tiles always fits exactly into the content width. The generated code contains content widths for all breakpoints from very wide to mobile.
2. The “max-width” statement which is generated on lines 100-106 of the “custom-styles.php” theme file, this is the one that limits the maximum width the content can have. It’s calculating its value from the Theme Options setting I mentioned in the above post, and based on what you described I still suspect this is what you’re after.
Sincerely,
Andrii / Satori Studio