How to edit a card description in full screen?

To enable the full-screen mode for the card description, please focus your mouse cursor on the description field, as if you wanted to start typing in it. You will see a stretch arrow in the top corner of the description field, which activates the full-screen view. To get back to the regular view, just hit the ESC button. Full screen description editing You can also use keyboard shortcuts within the task description field, please see them here.