Triggers are either green or yellow.
Green indicates that the trigger has its mandatory property set to true, which means that the trigger must be activated by a flow arrow into it in order for the process to be activated. Of-course when a process has multiple green triggers, all of them must be activated in order for the process to be activated.
Yellow indicates that the trigger's mandatory property is set to false, in which case the process will be activated regardless of whether this specific trigger is activated by a flow or not.
As JP explained, triggers on the Find template indicate filtering by the fields whose name match those of the triggers added to it. In your case, filtering by a column called Type which must appear in the table.
The fact that Type trigger is non-mandatory, means that if no value is specified on that trigger, Find will return those records whose Type column is empty (null). In your case, Find will always return the records with empty Type, since there's no flow into the trigger.
The behavior of the Find template is explained in some detail in the documentation page which should be accessible via context sensitive help, or here if you're running an older version of the studio.
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