The administrators have under control specifics of this page in the User page setup in Settings; they determine what fields will be visible for them and if their content can be changed.
There are several fields you can manage, the following screenshot captures just a part of them:
As you can see, every field has several options:
Predefined values for the field guiding users towards a better choice
Visibility for the admin and user view
Custom name (available for Custom fields; renaming them will make things easier for you and users)
Advanced Field mapping for G Suite synchronization purposes
Please note that the User view can't be set to "Visible, editable" if the Admin view is set to "Hidden".
You can decide if User changes requests will be automatically approved or not.
Please find that in the Automation Features section.