Mac users tend to change the font size of file names, folders, and other text in Finder of OS X. For users, who have weak eyesight, this can be very helpful as some default text size of Finder fonts are very small and difficult to read. Therefore, adjusting the font size is the only solution.
However, users also like to decrease the size of fonts in Finder, hence we have come up with this information for Mac users. Now you can adjust the text to large or small, choice is yours.
Note that default text size of Finder items is 12, which can be decreased to 10 and 11, and increased maximum up to 16.
How to Increase/Adjust Text Size of Finder Fonts in Mac OS X
Step #1. Choose any folder that contain files.
Step #2. Bring down the “View” menu → Click on “Show View Options“.
A “Preferences” window will open on the screen.
Step #3. Find the “Text Size” drop-down menu.
Step #4. Select the text size you want to keep → Click on “Use as Default” button seen under the same navigation panel as “Text Size” option.
This will set the size of text in all other Finder windows. If you haven't selected “Use as Default“, you can see the change in font size only in that particular folder within folder.