Please read this topics:

• https://wpforo.com/community/how-to-and-troubleshooting-2/titles-user-groups/
• https://wpforo.com/community/faq/nickname-vs-username-vs-display-names/

BTW, in most cases the title field should be managed by admin and moderators, so it should be disabled for Registered usergroup in usergroup settings ( Dashboard > Forums > Usergroups )

Editing user profile. I noticed that the "Title" field appears in the user information widget, below the user rank and in header of user profil page.

For what purpose was this intended and what should users fill in there? Natively filled in: "Member".
I'm playing with the idea of confusing title with occupation. So that it is clear in the profile header what the user's occupation is.
I'm just wondering if this can lead to complications in the future.

Thanks.