Salient 8.5.4 is Now Compatible with Woocommerce 3.3.1 . Kindly update the Theme if you have updated Woocommerce . 

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mobile full width, but keep the desktop in the boxed mode

Add this into the Custom CSS box located in your Salient Options panel (Make Sure there are no red cross in the Box) :

@media only screen and (max-width: 690px) {
    #boxed {
        width: 100%!important;
    }
}

Thanks