Switching off SQL Alert

Switching off SQL Alert

Good morning
      we are attempting to configure the SQL monitors with OpManager 12200 but am struggling to switch off the attached alert.

We do not want to monitor this as we have many MDF's that are bigger than this and they are all alerting. I have increased the threshold but i think it would be better to just switch it off. 

Can you please advise how to do this?

Many thanks
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