Big equation on mobile

Hi,
Thanks for the great application!
However, I have two problems:

• On mobile, I’ve managed to get the equations on several lines. But I have one that is a very long fraction and it goes off the screen without being able to see the whole thing. What can I do? Is it possible to set up a horizontal scroll or force the equations to be displayed in their entirety on one line?
• Sometimes I have percentages in an equation and it doesn’t work. Is there a solution?
  
  Thank you very much for your help.