Change Font In Question Bank

I had made a question bank of nearly 40 slides/question with multiple layers. I started poking around found one of the preferred alternate fonts for my company and wanted to switch all of the text to that font instead of the default. I know I can go slide by slide, question by question, layer by layer, and change the font in each and every text box. But is there a way to set a uniform font for all of it or to be able to change all of them in swoop? Thank you for your time and help.