How do I add a combinator to my style?
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
No. Component content entities do not have view modes.
You don't. You apply a Descendant selector. These use a (Space).
Custom styles are CSS styles for classes.