I am looking for a way to produce a workflow which puts users into groups (group A, group so that when group A is viewing the list, they have access to all entries of said list. While when a user from group B is viewing the list, the list will only show items which have been recorded within the last 30 days.

I have looked everywhere for a fix but mostly have been for an older version of Nintex. I am pretty new to Workflow so if this is an easy solution please be mindful