Two spaces displaying different navigations: why?

Hi,

I'm new to Confluence (joined the trial today).

So far I created two spaces

1) Global
2) Blank

Global was set up automatically when I joined filled with sample information, Blank set up by myself (using Blank theme) where I try to replicate the look of Global.

So far so good, however: the top navigation bar looks different in the two spaces

Global:

Blank:

In "Global" I can choose "{} Markup" from "+", in "Blank" I can't. Even when choosing "... View more" in "Blank" I can't see "{} Markup"

Why are they different? What can I do to see "{} Markup" in "Blank" too?