macOS High Sierra: Adjust font size in Finder – Here’s how
How to Customize Font Size in Finder on macOS
The font size can be adjusted relatively easily in the Finder. This can have a value between ten and sixteen. By default, the font size is set to 12. Changing the font size does not affect the size of the icons.
First, open a Finder window if you have not already done so. Then click on the "Display" entry in the menu bar at the top of the screen and select the option "Show display options". Alternatively, you can use the keyboard shortcut Command (cmd) + (j).
You will now see a new settings window with various options. Then click on the drop-down menu next to the entry "Text size" and select the desired font size.
The font size is applied with immediate effect and applied to every other folder in the Finder. In older versions of OS X or macOS it may happen that you have to set this separately, since the font size is then only bound to the individual folder. If this is the case, you may also see a different representation of the different settings on our screenshots.