You can delete only comments you created, with a safety net to undo.
Steps
Hover your comment and click Three dot menu (⋯) > Delete comment.
A success toast appears at the bottom left with Undo and an X to dismiss.
Click Undo within 10 seconds (or before you close the toast) to restore the comment.
Notes / Tips
If you didn’t create the comment, Delete option won’t appear in Three dot menu (⋯).
The toast auto‑hides after 10 seconds if you take no action.