Any luck with achieving the desired forecasting? I have moved this post to the Tableau Analytics Extensions space of the Community Forums. This space is the best location for asking questions about such things like leverage R in Tableau. Hopefully, someone here can assist if the question still stands.
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Can you clarify a little further what your goal is? Are you looking to show a forecast while filtering to just a single year of data?
In that case, you should be able to change the forecast range from 5 Months to 5 Years in the menu. Clicking on Months should open a drop down next to the 5 that will allow you to change it to Years. However, you should note that the validity of a forecast the is 5 times the length of the training data is going to be at best highly suspect.