Until earlier today, Stack Overflow had quite a collection of [tableau] questions, a large number of which were off-topic there. Now the tag has been renamed to [tableau-api] to emphasize that only programming questions about Tableau belong on Stack Overflow:
Questions about using Tableau are off-topic here. It is a data visualization tool, and unrelated to programming.
Where should these sorts of non-programming Tableau questions (one example: "Changing the X axis header title") be posted?