That is very strange, as cmd+comma has been my shortcut for "fit in window" for ages in Indesign, and it's only since the CC that it does not work anymore.
Even more:
- if I change it in illustrator, it works fine there
- if I change it to cmd+star that also works in Indesign (star (*) is also on my num. keys)
- the DEFAULT shortcut for superscript does not work on the num keys.
Where's the logic in that??