Yes, if you have a local smart campaign within your program with a Sync Person to Microsoft flow step for members of that program only, remove that flow step.
You may have other smart campaigns in your instance with Sync Person to Microsoft flow steps that are "global" -- for instance, the campaign might capture and sync all new leads in the instance. This is a common practice for Sync Person to Microsoft flow steps -- they are centralized in one program, since this flow step can only happen once per record for Dynamics integrations. (After the initial sync, all records are updated via the regular 5-minute sync cycles, and cannot be forced over.)
To review your instance for other Sync Person to Microsoft flow steps, go to Marketing Activities > Campaign Inspector and look under the Flow Actions column.
If you need to modify another campaign(s) that is unintentionally syncing leads, add a filter to the Smart List to exclude those records. 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]". This will remove the records that meet the criteria from the smart campaign flow steps.
(If doing this, make sure there are not subsequent flow steps that the records should be processed by.)
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