So one way is to create 2 calculations for your labels...one where it's negative and one where positive
[Rendimento - ve]
IF SUM([Rendimento]) < 0 THEN SUM([Rendimento])END
[Rendimento + ve]
IF SUM([Rendimento]) >= 0 THEN SUM([Rendimento])END
As there is no ELSE if the test fails it equates to NULL and Tableau won't plot NULLs
You can then bring both onto the label tile and set it up like this
And Voila...you're done!
Negative Labels in Red.twbx 8.3 KB
It works great !