If you refer to Qilu Securities' stock machine, you can adjust the font size in Online Service-Display Settings-Font Size. If you refer to the stock trading software installed on your mobile phone, you can't adjust the font size. If it is another version of the investment hall, it is also adjusted in' Online Services-Display Settings'. For details, please contact Qilu Securities National Unified Customer Service: 95538, and we will serve you wholeheartedly.