Reply To: i want to show 1 single row with a maximum of 4 products.

Hi,

Clear your browser cache: Clearing your browser cache can sometimes solve issues with settings not being applied properly. Clear your browser cache and reload the page to see if the product per row setting starts working.

Check the theme and plugin compatibility: The product per row setting in the Woodmart theme may not work if there is a compatibility issue with other plugins or the WordPress version. Make sure that your theme and plugins are up to date and compatible with each other.
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. If the issue remains, share the wp logins details of your site i will check and give you a possible solution.

Best Regards.