Greetings,
In my Mathematica 10.1.0.0 Home Edition if I make a cell into a subsubsection, that cell looks like a subsection. However if I go to the start of the line and press tab, then the cell magically turns into a subsubsection. Queer!
Best,
Dean Sparrow
In a NEW notebook, if I format the first cell as a subsubsection, it looks like a subsection. If I do the same thing as, say, a title, then it looks like a title. Bug, yes!
No bug. This is a good thing. This is a keyboard shortcut that cuts down on reaching for the mouse. Does your word processor not do the same thing for bulleted or numbered lists?
Adding another tab at the beginning gets you a subsubsubsection. Removing a tab at the beginning reverses the process one notch.