There's already a process action called "Change filters” (link), this allows for manipulation of the set filter inside a process flow. Yes, this does not pop-up the filter for the user. You can alternatively try out the Start empty with filter setting in Subjects:
Start empty with filter setting
Does this suffice or are you missing some functionality?
Unfortunately, this idea has not received many votes. Because we want to keep the focus on ideas that are in high demand in our Thinkwise Community, we are closing this idea.
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