You can see the most common reason why you can turn off the tile for an employee:
Simplifying employee records as some organisations prefer not to store titles at all.
Making it optional, you can change the field from mandatory to optional so users can leave it blank if they want.
Removing it completely as setting the field to Disabled hides the title field from employee profiles entirely.
To make the title for an employee as optional, follow the below steps:
Click Configuration then click Settings.
Click Field Settings then search FormData_Person_m.TitleId and FormData_PersonPre_m.TitleId.
Click into the setting then change this from mandatory to Optional or if you want it to be removed completely click Disabled.
Click Save.