Product item grid options not work

Hi. Is there an option in the cms where I can change the number of columns in which my products are displayed. At the moment I have set the number of products to be display per page to 4, but this theme show 4 in firt row.

the second line shows only 1 item, please help

my webpage is https://casauniverso.co.mz/loja/

I am using this template https://wp-demo.oxy-theme.com/

Thanks