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 Menu hidden by Wordpress Toolbar

Try adding this into the custom css box located in your Salient Options panel:

@media only screen and (max-width: 690px) { #wpadminbar { position: fixed!important; } } 

Cheers