Can you clarify:
If you need to modify another campaign(s) that is unintentionally syncing leads, add a filter to the Smart List to exclude those records.
>> What would the filter be to exclude the record from CRM when set up in the Smart List?
Or, try removing the records from the flow of the campaign: Prior to the Sync Person to Microsoft flow step, add a flow step of Remove from Flow, select Add Choice, and create a condition like "If Filled Out Form is [your form], Campaign is [this campaign]".
>> It is only 3 campaigns (3 programs) that will be exceptions. Each has their own flow. - If I remove the step from the flow about sync to CRM why would I need to add another step for 'remove from flow'? By eliminating the sync step, doesn't that take care of it?
Yes, that would take care of it if those are the only smart campaigns that are syncing those records. Just remove the flow step.