You may have noticed the “Use filters” option when building campaign smart lists. This setting allows you to decide if the filters need to be evaluated with an AND or an OR operator.
Changing smart list rule logic only applies to filters, not triggers.
Triggers are always evaluated as OR even if the above setting is set to ALL. Here’s an example:
The above smart list in words:
IF person fills out My Form OR IF person visits My Page AND Industry is Marketing AND Country is USA THEN follow the campaign's flow step(s)
So, if a person fills out the form or visits the page, the campaign will then evaluate that person based on all or any of the subsequent filters, depending on the setting used.