Remove File from Shortcut Widget


I have the shortcut widget with a number of files linked.

One is no longer relevant so I want to remove it, but I can't seem to. There is only the 'Add Shortcut' option.

I can click it but that only gives me the option to edit the text but even if I remove the text, the icon is still there and the icon can be clicked.

Any ideas as it's driving me round the bend!