Hi @grafiman!
Thank you for reaching out.
You could change how many products per row you want to display on your store by going to Appearance → WooCommerce → Product Catalog
and selecting the number of products per row you want to display with the Products per row option. It will apply to mobile and desktop.
More on this here: https://woocommerce.com/document/woocommerce-customizer/#product-catalog
However, there isn’t an option in WooCommerce core to select the number of products per row just for mobile; you would require customization to achieve it.
Kindly note that custom coding is outside our scope of support.
Searching, I found some threads and articles with codes that could help you to display one product per row or two products per row on mobile, but not the specific customization you want to achieve. You can take a look at them for pointers:
* https://www.ads-software.com/support/topic/display-1-product-per-row-on-phone/
* https://stackoverflow.com/questions/62519222/display-1-product-per-row-on-mobile-view-in-woocommerce
* https://www.ads-software.com/support/topic/display-2-products-per-row-on-mobile-view-2/
* https://stackoverflow.com/questions/43717951/display-2-products-per-row-on-mobile-view-in-woocommerce
Anyway, I am leaving this thread open for a bit to see if anyone can chime in to help you out.
For additional assistance on this topic, we recommend getting in touch with one of the customization experts listed on the WooCommerce Customizations Page; they can help you build the customization the way you need it.
Cheers!