Hello @Laskowidz,
1. Please turn on the Sticky Add to Cart option under XStore > Theme Options > Woocommerce (Shop) > Single Product Builder > Add to Cart & Quantity. For a better reference, please refer to the image provided here: https://postimg.cc/VdKzqtB6.
2. Additionally, you may turn on or off the Buy Now button as per your needs under the same section. For a better reference, please refer to the image provided here: https://postimg.cc/B8mZJwMJ.
Best Regards,
8Theme’s Team