Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Try doing 'RETURN' + FDISP
to toggle between fraction display mode, and decimal display mode. (The 'RETURN' button would be the one with the twisted arrow on it.)
Let me know whether that works... I want to be sure I got that advice right for your model of HP 32SII calculator. Thanks.