That means you should avoid writing it’s in a formal essay. If you cannot resist, though, remember that it’s means “it is.” Its is a possessive pronoun, like his or ours.
“One,” “the reader,” “readers,” “the viewer,” or something similar sometimes can be used effectively in place of first-person pronouns in formal papers, but be careful not to overuse these expressions. You want to sound formal, not awkward and stiff.
she/her/hers, they/them/their In academic or college writing, most formal essays and research reports use third person pronouns and do not use “I” or “you.”
9 Tips for Formal Writing StyleThe Style of Formal Writing. Use the active voice. Use literal and concrete language. Be concise. Be careful with placement of descriptive words and phrases. Do not use abbreviations or contractions. Avoid repetition. Always try to put statements in positive form (do not put them in negative from).