Related products in 1 row over 4 col


I am trying to get the related products in a single product page to show the images over 4 col and 1 row. However, I keep stuck on 1 col and 4 rows. Using Custom Page Templates the latest version, Theme The 7 v. and Woocommerce v3.3.3. My WP version is the latest.

Can anyone help, I can’t find where I go wrong.

Thanks in advance,
Gr. Rob