I have an interactive document with editable textfields
Can I make it so the user can change the font or even can I select a default font like helvetica for example?
at the moment it is always in times roman when I edit in acrobat?
I am just wondering what is the best way or who should stipulate the font style the creator or user?
If the user has a copy of (paid) Adobe Acrobat, the could edit the form fields.
If the user has a (free) copy of Adobe Reader, they cannot.
As Steve states, the user can't change the fonts unless they have Adobe Acrobat.
You though, can easily change the font from Times to Helvetica by opening the form you created in InDesign in Acrobat where you can also change the alignment, size, and color.