Virto List Form Extender allows you to adjust access to the fields of your list. You can select groups of SharePoint user or a single user who will be able to view a field on an item form (new form, edit form, view form).
Go to Virto Form Extender Settings of a required list and add new settings or edit one of existing settings.
Note: security settings cannot be applied for required fields.
Roll down to “Field security for view (new/edit) form” and select SharePoint groups These users will be able to see this field on a corresponding form of the field.
Note: “Show to all users” is selected by default.
To enable view options for a single SharePoint user, enter some letters of his name and click “Check names”.
Or use “Browse” button to search a required user on the site.
Now only user of selected groups will be able to view the field in a form.
This way you can adjust security settings for each of three field forms: new form, edit form and view form.