There are certain titles that do not allow you to edit the Fonts. You can’t change the style of some animated titles, such as Pixie Dust and Lens Flare, or themed titles, which are represented by gold title bars.
Interestingly, if you have Final Cut Pro X, you can edit these titles, including the fonts, but not in iMovie.
For more see this portion of Help.
Thanks much! Fabulous hints about the Gold Bar! and the Final Cut Pro. I do have an older copy of FCP. So If i really need to edit them maybe this version will work!
BTW - that leads me to another question. I'm disappointed to find that iMovie has limitations on the magnification / zoom of the Ken Burns effect on stills. Would FCP allow you extreme closeup starts and finishes too? Again, many thanks!