My son is stuck in third person on Minecraft on the PS4.....we have tried looking online and pressing down on the left stick etc but it isn’t working. He would like to get it back to first person.....

My son is playing Minecraft on the PS4, and somehow, he got stuck in 3rd person and we're trying to get him back to 1st person. We tried moving the left stick, etc... but still nothing.

How do we toggle his perspective back to 1st person?