Hello,

1. You need to create an attribute with title and slug “photographer”, then choose this attribute in the Theme Settings > Shop > Brands http://prntscr.com/l6e7w0, In this case, this attribute will act as a brand.

2. Add this code to the Theme settings > Custom CSS:

.tax-pa_brand  .main-page-wrapper .container .content-layout-wrapper .col-lg-9 {
    width:100%!important;
    min-width:100%;
}
.tax-pa_brand  .main-page-wrapper .container .content-layout-wrapper .col-md-9{
     width:100%!important;
     min-width:100%;
}

Best Regards