When using “Change Filter” in a process flow it always reverts to “Equals”, it would be more useful if the filter condition could be changed, to “Contains” for instance.
Also, the Docs article on the subject contradicts itself on this matter:
Filter values on columns of a specific subject can be set with this process action. It can be indicated for each column which filter condition and which filter value must be used.
However:
The filter value that must be set on the column in question as an equal to filter condition. This parameter is present for every column of the subject.