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Found under Hello > Account Settings > Marketing Automations.
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Allow priority to be managed in Marketing Automations (if checked, supporters can only be on one Automation at a time): With this setting enabled, users will be able to drag and drop automations into a priority order in the marketing automation dashboard. If supporters qualify for more than one automation at the same time, they will only ONLY be added to the automation with the higher priorityHigher Priority.
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If it is disabled, supporters can be on multiple automations at the same time.
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The account setting ‘include supporters, active in journeys, to all outbound email broadcasts’ must be enabled in order for supporters to be included at the automation level
If 'Exclude supporters on this automation in messaging broadcasts’ broadcasts’ supporters will not receive broadcast emails if they are in the select marketing automation.
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With the account setting enabled, Users will see something like this when sending a broadcast email.
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