How do I remove an association of a threshold to an attribute

How do I remove an association of a threshold to an attribute

I accidently added a size restriction threshold to the Free Space % attribute and now I cannot remove it.

I've managed to remove the alerts based on this association but I cannot remove the threshold and so the monitor keeps reporting it as an issue I believe.

How do I remove the association on the alarm for the monitor?

Thanks,
James.

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