@dingo said:
Since they have changed the railing from obscure glass to clear glass people can look directly into our unit as we are on the ground floor.
I think I would also be asking the Owners Corp to restore the privacy of your unit by applying a partially opaque tint to the balcony glass. They could and should so that for all all ground-floor units, for the sake of uniformity, if nothing else.
But it sounds like you are free to install internals shutters regardless.