You can adjust the spacing between slides, use the data-space-between attribute. 

<div data-wm-plugin="collection-carousel"
  data-source="/journal"
  data-space-between="0"
></div>

To adjust the spacing differently on desktop (lg), tablet (md), and mobile (sm). Adjust the associated data-attribute below. 

<div data-wm-plugin="collection-carousel"
  data-source="/journal"
  data-space-between-lg="54"
  data-space-between-md="34"
  data-space-between-sm="17"
></div>
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