The antonyms for the phrase "opened to view" are numerous, and they all convey a sense of being hidden or concealed. One antonym could be "covered," which implies that something is hidden or obscured from sight. Another antonym could be "concealed," which means to keep something secret or hidden from view. A third antonym might be "shut," which implies that something is closed off or inaccessible. Other antonyms for "opened to view" could include "veiled," "hidden," "obscured," "masked," or "camouflaged." Ultimately, these antonyms all suggest a sense of secrecy, privacy, or hiddenness, and can be used to create a sense of mystery or intrigue in writing.