Hello Will,
Thank you for the reply. I've attached a screenshot here. As you can see, the Tab module is not displaying as designed when using the Adventure Works theme. We will be opening a ticket with Microsoft as well. Where it says "Title" and "Title" on the screenshot below, those should each be tabs, and the content blocks below that are what is supposed to be contained in those tabs.

UPDATE: We did put a ticket in with Microsoft. It turns out that the Adventure Works Theme that Microsoft put out is missing the tab.scss file and the import @tab.scss statement in the index.scss file. Hopefully they will fix this oversight in a future update. For now, we are attempting to clone the Adventure Works theme in order to make changes, package them, and deploy them to our site.