To manage FiboFilters settings, a user must have the manage_options
capability.
By default, only site administrators can manage FiboFilters, but users with the “Shop Manager” role can also be granted this access. You can do it by applying the following PHP snippet:
It works only since FiboFIlters v1.6.0.
add_filter( 'fibofilters/shop_manager_has_access', '__return_true');