A comment panel is a card on the canvas that shows a whole comment thread as a conversation: each comment is a bubble under its author, with your own on the right. You read it where it sits, without opening anything.
Type in the box at the foot and press Enter to post. On a team document you can @mention teammates, as in any comment. Once there is a thread, a Resolve chip sits in the panel's top-right corner; a resolved thread fades back, shows a green Resolved chip and offers Reopen Thread in place of the reply box. Hover one of your own comments to delete it. Resize the panel to see more of a long thread: the text stays the same size and more of it fits.
The panel's title is its label, or Comments when it has none. On a view-only link, in an embed or while presenting, the thread is readable but there is no reply box and no Resolve.
Adding one
Add one from the palette's Record category, one of the six Collaborate categories to put a remark on a place: an empty patch of canvas, the gap between two clusters, the spot where something should go.
A panel can also be about an element: drop one beside it and join the two with an ordinary arrow, the same way you connect anything else. Nothing bespoke: an arrow is what "about" already means on this canvas, so the pair moves, exports and behaves like anything else you have drawn. (For a remark that stays with the element itself rather than on the canvas, use Add Comment in the element's menu instead.)
Panel or comment badge
You can already comment on any element by selecting it and using its comment badge. That popover is one reader's transient view: it opens for you and closes again.
A panel is the same thread, composer and resolve button, left out on the canvas, so it is in the export and in everyone else's session. That is what makes a remark part of the canvas rather than a note somebody left.
It does not fold away
A collapse-to-summary was built and then dropped, because a panel you deliberately put on the canvas is there to be read, and folding it hides the whole point of it behind another click. If you do not want a thread on display, the element's own comment badge is still there.
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