How to hide details popup on people picker field

Hi harishpatil​ , you can use column formatting to override the standard behaviour.

Try this code to show just a user name. You can style the output using some additional attributes.

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "@currentField.title"
}