Well, I hardly can say: 'Learn from Mariette', as this neat tip I learned from my baby-sister Gerd.
She also kind of motivated me to finally start my own Pinterest...
The button that brings you to it, you find at the top right on my blog.
Gerd told me that it is as easy as 1.2.3.
Open your account and click on boards, so you have them all in front of you.
Now Click on a board then drag and drop it to the place you want it.
Almost in its new spot...
Keep repeating this till you got them all lined up alphabetical, which gives you a far better overview.
And above all, anyone else that will visit your boards on Pinterest!
Every time you do add a board, you still need to manually drag and drop it into its correct spot.
Only when you Pin something onto your own Pinterest boards, they show up alphabetical but NOT on the actual boards. That's something you accomplish by the simple drag and drop method.
Hope this was helpful for you as well.
You can thank my sister Gerd in your comments.