Hi,
This is a current limitation in the question step. If you are familiar with Workflow Manager custom step development you can create a custom step and control the form re-size properties to support large texts.
I also tried this out with the drop down option for questions and it displayed the entire question (not the title) but this might not work for you because you only want to display the OK button. I just thought it was worth mentioning.
Thanks,
Tope