Here is a question for you: if I say "in front of" it refers to persons that look each other or not? Should I say "opposite"?
The prepositional expression in front of means ‘close to the front of something or someone’. It is the opposite of behind:
A really tall man was sitting in front of me and I couldn’t see the screen properly. or I was sitting behind a really tall man and I couldn’t see the screen properly.
You can read the difference between "opposite" and "in front of"
You could have found it by searching in any dictionary
The elephant is in front of the chair.