Logic in Marketo is important for managing things like segmentation, but also triggered campaigns.
All orange triggers are considered to have an OR between them. This is an important and very powerful feature. If you have any Triggered criteria, you can only use ALL or ANY as options, but these operators only apply to the green filters. Multiple Triggers use the OR operator between them, such that any trigger will fire the campaign if the Lead matches the remaining Green filter criteria.
How would that work in Marketo though?
In this case, if a lead matches this trigger, the flow will continue.
If either filter matches, the lead will qualify for the flow. In this case, the lead must Visit a Web Page AND be a Member of the Smart List, OR Change Progression Status AND be a Member of the Smart List.
Multiple Triggers and Filters
The lead must match any of the triggers, but also all of the green filters. So you could understand this one better by taking each orange trigger plus the green filter logic separate from other orange triggers.
Thus, the lead must match either of the Triggers plus both green filters to continue. Changing this to ANY, would mean that as long as either Trigger matched AND either green filter matched, the lead could continue.
See more details in my Marketo reference guide: