When you upload drawings to Procore, you choose a new or existing drawing set to associate with the collection of drawings. Drawings in the same set will generally have the same drawing date or serve the same purpose, such as being revisions to previous drawing versions. Examples of common drawing sets are Tendering, Issued for Construction or Amendment/Addendum.
While the Drawings tool shows 'Current Drawings' by default, you can view a specific set of drawings by clicking the 'Drawing Sets' view. See View Drawings. While a drawing set is used to label and organise drawings, a drawing area is an optional feature that allows you to completely separate drawings within a project. See What are Drawing Areas?