To put a new line, it is quite easy, just put this:
And make sure that the “word wrap” option is on:
So for instance, I will create a measure by clicking on “home -> new measure” and I put a phrase. To see the result, I will create a “card” in the visualization and in the “fields”, I put the “measure”.
As you can see, it shows in 1 line because the “word wrap” option off.
Now if I turn on the option, I have 2 lines: