I’ve just updated the plugin and it should work with Storefront now.
If you simply want to hide the Breadcrumbs, then you can just untick the ‘Enable breadcrumbs’ setting.
If you want to leave the breadcrumbs enabled but change some other settings, you’ll need to tweak the ‘Breadcrumb separator’, ‘Wrap before’ and ‘Wrap after’ settings for the breadcrumbs to display properly in Storefront.
Those three settings should be changed to the following:
<span class="breadcrumb-separator"> / </span>
<div class="storefront-breadcrumb"><div class="col-full"><nav class="woocommerce-breadcrumb">
</nav></div></div>
See this screenshot for clarification:
https://share.getcloudapp.com/NQuDOLy4