Use the Properties bar. Cmd/Ctrl + E. You can read more about the Properties bar here. Learn how to add or replace text, correct typos, change fonts and typeface, adjust alignment, and resize text in a PDF using Acrobat.
 
 

Adobe acrobat x pro change comment font size free download. Change the default font for adding text and fallback font for editing PDF

 
This default behavior can lead to fonts with an inconsistent appearance in a PDF document.