Hi SandraLewis, 

Thanks for reaching out. Was this a question for Sage Accounting online software or for Sage 50 Canada. 

Since Sage Accounting is accessed via a browser, you should be able to hold down the CTRL button on the keyboard and then also press either the + or - buttons to increase or decrease font size. 

For Sage 50 Canada, here's an article on how to change font size using system resolution settings for Windows.

Warm Regards, 
Erzsi