I am trying to fill out a fillable pdf form and the font is too large (you can only see half of the letter). How do you adjust the font size on a fillable form on Adobe Acrobat Pro DC?

Click on the specific area (eg: 'box' within the form) that you want to change font size. Click on that and a window will come up called "Text Field Properties". Choose the font size you'd like to use.  I like 10 pt. Then, close the windw. Once you do that, suggest you 'Preview' (blue button on right sidebar) and test out that area on the form to see if you like the new size. You'll need to change the different all the different / fillable areas on the form for consistency. Wish there was a universal way to do this. but that's how it works currently. Good luck!

No need to post the same question twice.