It isn't possible to change the format for staff names on the Parent Portal, only in printable timetables.
The default format is Salutation, surname e.g. Mr Smith. See how to change this here: Parent Portal and Parent App Settings
This controls the format of staff names only. To control whether staff names appear at all (or which staff member shows for cover), see: Control how staff names show to student and guardian calendars and timetables
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