Several Mac apps let you enlarge text and pictures via ⌘+. Sometimes it’s ⌘ and Shift and +, so try that too. The “+” should be the one above the = key, though the one on the numeric keypad might work. Apps where this works include web browsers, Mail, Microsoft Word, Pages, Messages, and probably more.
Want some more, longer how-tos?
Visit my other website, christianboyce.com