How to change the Name on Button to 2 lines

I’ve set the “Change Price” button as picture. It’s 2 lines appear on panel.

Then I try to do the same for “Change\Quantity” button but it’s not work.
The problem is I don’t know how was I set the “Change Price” button.

Could you please advise…

Use \r


Thank You so much! :heart_eyes::heart_eyes: