How do I change the default font in Illustrator CC?

That changes only the default character style for that document only. That does not answer the question.

I don't think it's supported.

By @anthonyc78776180

Do you have that same problem? What is not working for you. Please elaborate.

Your library folder may be hidden. Google : Library folder Mac

and change the Print or other preset from User > Library > Application Support > Adobe > Adobe Illustrator 23 (or your version number) > en_GB (or your language folder) > new document profiles

I changed all the permissions for the folders, which takes a lot of time. Then I saved the files with a one after them, then deleted the original files, and changed their names back. However, this method didn't stick, meaning I need to change the default manually in the character default document window. Since I know where this is, it is easier to do than changing it all the time, but still frustrating. I am also frustrated that in using Illustrator 2019, one cannot do this in a preference box. This whole experience of using Illustrator 2019 has been a mess, since switching over from CS6. I know I had to do it because of system software issues with the Mac OS, but the lack of documentation has been quite embarassing to say the least. I don't know how you can charge a monthly fee, but only give videos for documentation. Who has the time to devote to watching videos when you are trying to complete projects? This is madness...

You need to change the default character style in the New document profile you use:

Work with files and templates in Illustrator

The folder of profiles in the Applications/Adobe Illustrator are the ones used to repopulate your user preferences files if you Replace Preferences. You actually need to replace the New Document Profiles in both places for it to be permanent.

You would change it in an existing file the same way including the Save As to overwrite the existing file. In an existing file go to Window>Type>Character Styles. Make the changes as above and the use Save As.

Hi

Did you work this out? I just had the same problem, you need to change the permissions for the file in Finder (if you're on a Mac) so that you can read and write. Shouyld do the trick.

LGS:

Thanks for your fast, on-target response:

The path you are looking for is Window>Type>Character Style in the New Dcoument Profile you wish to change.

Thanks  for your patience on this point.   I spend a lot of time away from AI, and it is easy to forget such basics.   OK, got it, whenever I need a panel, look in Window> ... at the lowest levels.  That's written in neon letters in my brain now.  

When AI opens a rester image, no document profile is applied as evidenced by the lack of swatches in the Swatch panel.

That's definitely good to know, though a bit indirect.   Why not have a status window display the current profile, or "none" in the case of raster images? 

That said:  From a s/w engineering point of view, it doesn't make intuitive sense that there would be this exception case, apparently the only one, in which you can arrive at a new document, ready-to-edit, without a profile established.   When I drag-and-drop a JPG on AI, I get some kind of consistent, if not complete-with-swatches, environment.   Why not allow some user control over that?  More about this below.

If you want to add things to a raster image, you would do better to call a new document from the New Document profile you want or have modified to your liking and Place the raster file (embedding it). Doing this ill make all the thing you want available, especially the font.

Yes, I understand that fully.  For this particular workflow, multiple JPGs that need a bit of text added at the bottom,   I seem to have a choice between a) using drag-and-drop, requiring for each image the tedious restablishment of the text environment I want.  Or b) using Place,  as you suggest, which requires a different set of tedious overhead clicks, and does not have the advantage of being able to drag-and-drop to AI an entire group of the JPGs at once. 

(I'm guessing AI is scriptable, so I could probably work out a way of doing this more automatically using Applescript, but ... I'm pressed to get the JPGs annotated NOW and it seems a significant detour to arrange the scripting.)

To return to the point above:   When I arrive in AI after dragging-and-dropping a JPG,  at least some partial work environment is set.  My main issue is this:  I've standardized on Helvetica, I want to use Helvetica, and it would be sufficient if I could replace the default Myriad Pro Regular 12 with, say Helvetica Regular 14.  Permanently.   I'm guessing that Myriad Pro isn't hard-coded into AI CC, so there should be a way to do this.  

(In DreamWeaver, I'd look for a JavaScript code that's run just after a new edit window is opened and see if I could change the current font at that point. But... I'm completely ignorant of AI scripting, it isn't immediately obvious that it is parallel to DW, and that's another detour, when someone is banging on me to get the @$$%Q$*#$ JPGs annotated.)

So... any chance of permanently replace Myriad with Helvetica?

Thanks!

Here is how it works in CS 2-4: http://helpx.adobe.com/illustrator/kb/change-default-font-illustrator-cs2.html