Hello,
We can’t check your site – https://prnt.sc/IvBVkc7fVVqe
1/ Change text using translation, for example, activate Loco Translate plugin > create a translation for XStore Core plugin > change English text and disable the Loco plugin.
https://xstore.helpscoutdocs.com/article/30-base-theme-translation
2/ Theme Options > WooCommerce > Shop > Products style > Add To Cart With Quantity > Off
Regards