User is able to edit custom field 'Billable' on financial subpage of Project in list view. User does not have edit access to financial subpage, also the list view settings at object is set to 'Use display conditions and secured subpages to protect attribute values on this list.' Where user is getting edit rights from in the list view how can we prevent her/other users from editing this field. The user is able to edit other fields from project list layout when configures them as 'Allow Grid editing' from classic.