Hi bajkai ,Microsoft removed the option to adjust the font sizes in the Creators Update
Most Users are using a great small free utility called Winaero Tweaker, which will let you adjust font sizes anywhere in Windows 10.
To adjust the font and font size in File Explorer:
Open Winaero Tweaker
On the left click Icons in the Advanced Appearance Settings Section
Then click 'Change Font'
Set your Font Size . . . etc.
Click Apply Changes
Then either log out or restart your PC for the change(s) to take effect
Click the link below to get WInaero Tweaker:
https://www.techspot.com/downloads/6911-winaero...
Another free alternative is System Font Size Changer, which does not even need to be installer
https://www.wintools.info/index.php/system-font...
Note on that webpage, scroll down to the very bottom and click the dark red download button
to download System Font Size Changer