ahh ok.
The delete icon was just off the side of the panel. It doesn't display a slider bar if the properties panel is too small.
Ok. so I've clicked to remove the icon.
The blank icon is still there and I get an error whenever I click to edit the text.
"An error has occurred. See error log for more details.
Figure is not a child"
It doesn't crash and I can still edit the text, which is good.