What other words can be used instead of "hideable"?
I have recently had this very same dilemma. In the end I went with 'hidable'. It is extremely clear what is meant, and so is better than using a word like removable or the ugly toHide. It doesn't appear in every dictionary but according to Merriam Webster it is a word; though without the 'e'. That's good enough for me.
There is also concealable. Free dictionary has an entry for it as an adjective formed from the verb to conceal (synonym of hide). YourDictionary defines it as
Able to be concealed.
Ngram gives it preference over hidable and hideable.