You can change cropping in code. I suggest that you create Child theme first and follow instructions for overriding Content Manager elements (Documentation -> Customizations -> Customizing Content Elements).
After that you can modify your “portfolio / portfolio.php” on line 66:
$params = array('width' => 584);
and line 68:
$params = array('width' => 1168);
You can change this directly in theme (“wp-content / plugins / elvyre-core / includes / content-manager/ portfolio / portfolio.php) which I don’t recommend because you won’t be able to update theme without loosing modifications.