The Performances Sub-tab
The Performances sub-tab lives inside the Library popover's Transitions section, alongside Crates, Tracks, Transitions, and Set Lists. See The Transitions Section for the section's overall layout.
The sub-tab lists every set-list run that was ended with a recording. It's a library-wide history, not scoped to any one set list or venue.
For the row content (set list name, venue, played-of-total, relative date), the sort and group controls, and the right-click actions — Create set list from this and View source set list — see Reviewing Past Performances. The full workflow lives there; this page only flags where the sub-tab sits in the popover's navigation.