You'll notice
The above-prompt and pane display code was rewritten with explicit dock/inline placement and a tab bar for multiple open panes
What
The internal code that draws the area above the prompt and any open panes (secondary panels shown alongside the main conversation) was substantially rewritten. It now passes an explicit placement value — either "dock" or "inline" — when deciding how to render, and adds a new component that shows a horizontal tab bar listing the titles of all open panes whenever more than one is open.
Why
The tab bar gives a way to see and presumably switch between multiple open panes at once, rather than only being able to view one at a time.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not say whether the tab bar lets you switch between panes or is purely a display of titles.