Currently if you have two unrelated tables with similar columns, a slicer will only show the values of and allow filtering of one of the tables. This means that a user has to provide duplicate slicers, one for each table, where they can select the same values.
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This actually sounds more like a data modeling problem. Why do the two tables not share a relationship to a lookup table that contains the values you want to put in a slicer instead of repeating them in each table? I think you could set this up nicely in the Query Editor.