Marco Russo and Alberto Ferrari lay out a challenge:
Tabular offers the built-in feature of hiding rows of data from specific users. For example, you can create a set of security rules to let a store manager see only the sales of their store. This works fine if your goal is to secure data, which means preventing access to data that a user is not expected to see.
Another common requirement is to be able to select by default, for a store manager, their sales. With that said, store managers can see the data of other stores, but they need to explicitly request it. In other words: by default, the store manager sees the sales of their store only. By using a slicer, they can choose a different combination of stores.
Read on for the solution, but be sure to read the warnings Marco and Alberto include near the end of the article.