Hello,
2/ Those options are enabled now -> https://prnt.sc/uKCaJpW4nIf6 and https://prnt.sc/VktVDXRcnHKJ. If you want to disabled/enable but you can then please, clear browser cache and check again.
3/ Add next custom css to Theme Options -> Theme Custom CSS -> Mobile
.single-product-builder .et_product-block form.cart {
flex-direction: row;
}
.et_product-block .cart .quantity {
margin: 0 var(--single-add-to-cart-button-spacing,15px) 0 0;
}
.single-product-builder .et_product-block .single_add_to_cart_button {
min-width: unset;
}
.single-product-builder .et_product-block form.cart .quantity-wrapper:before {
display: none;
}
4/ What are the steps to reproduce the issue ? Could you please, write them for us or check the log a bit later (your log could be updated when we checked the problem and implemented our solution).
Also, there is no reason to copy the full log to private content – screenshot of log will be enough for next time.
5/ Yes, we added you example of filters in your child-theme/functions.php
before -> https://prnt.sc/QV1OvTpWfDJm
after -> https://prnt.sc/vxKPjzQ2p0yg
Backend -> https://prnt.sc/g9PfKa0cPifc
Please post different questions via separate topics, next time – https://www.8theme.com/forums/xstore-wordpress-support-forum/
Regards