How to disable SSL Scanning in mail shield from administration dashboard

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So we use Meraki agents on all of our workstations and realized (thanks to the forums here) that avast is blocking the agents because Meraki uses port 993, which is being blocked from the mail shield. On each individual client I can go to the mail shield settings, go to "SSL scanning" and disable the "Scan SSL Connections" option. But I can't for the life of me find where to do that from the administration dashboard so it applies to all of my workstations in my groups. Any help would be greatly appreciated!

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For the "What it's worth" category, I went ahead and went into Expert Settings and changed the port that Avast was scanning for IMAPS. So it's no longer scanning port 993. Not the best solution, but so far seems to be one that works.