If you would like the cart summary to always be visible on mobile, you can use this CSS. Simply place it in WP Admin > CheckoutWC > Appearance > Design > Custom CSS:
Or to only make this change on the payment tab, you can use this variation:
If you would like the cart summary to always be visible on mobile, you can use this CSS. Simply place it in WP Admin > CheckoutWC > Appearance > Design > Custom CSS:
Or to only make this change on the payment tab, you can use this variation: