You can use Hover Text to enlarge blocks of text on your Mac for easier reading, without changing the font size everywhere else.
To learn more about this topic visit the following articles:
Use Hover Text on Mac: https://apple.co/2X0z0Uz
Use your trackpad to zoom in to make an image larger on Mac: https://apple.co/2Z8HQlJ
Use accessibility features on Mac: https://apple.co/2X3wtJv
Additional Resources:
Contact Apple Support for Mac: http://apple.co/Mac
To subscribe to this channel: https://www.youtube.com/c/AppleSupport
To download the Apple Support app: http://apple.co/2hFtzIv
Apple Support on Twitter: https://twitter.com/AppleSupport