Help with how to make score bigger and text bolder- not page size, just size and boldness of entire score to make it easier to read?

Hi, please can anyone help with how to make the score bigger and all the text bolder- not page size, just size and boldness of entire score to make it easier to read? If your eyesight is not great or light is poor the standard text and print depth is hard to read. I am mainly using the banjo tab section , if that makes any difference. many thanks