Question about YouTube display name


I just made a YouTube account for my new blog. The blog's name is Fire Digita but since Google requires us to do a single word for our YouTube account, I had to do FireDigita. How ever, on my channel, the displayed name (not the account name) is FireDigita and I would like to put a space between the 2 words. I've seen other accounts doing it (like The Verge) so I don't know why I wouldn't be able to do it.

Thanks to anyone who will help me!