Trying to change to two column portfolio

Hi, Is it possible to change the front page portfolio layout to two columns please? Currently seems fixed at three. Some instructions online indicated you could change layout through Wordpress dashboard> Pages > Portfolio page, but when I go there it always says "Your site doesn’t include support for the "visual-portfolio/block" block. You can leave this block intact or remove it entirely.", even with different themes. No plugin I have found seems to help either. I also experimented with differend Additional CSS and looking around with Inspector to try to work out which code to add but nothing seemed to work. Does Costello Pro let you change the layout at all? Can't see any indication in Features but maybe I missed it. Site is https://stevenfayers.net Thank you.