[SalesForce] How to restrict field level access in record types using page layouts

According to this documentation:

Lightning record, home, and utility bar pages available in: Lightning Experience

And this documentation, the mobile cards are the way to go.

Edit is a CRUD permission on the Object, in this case Opportunity, defined on profile/permission set level. So as long as a User on say Profile A has Edit rights on Opportunity, they will always be able to view the Edit button all across, if the button is available on the page layouts.

Your options here are:

1. Change the OWD to Private.

   As long as Users from Department A do not own the records for record type t,u,v,w, and that such records are shared to them as Read Only, they won't be able to edit any record, even though if Edit button is available on the page layout

2. Without Changing the OWD.

   Create a different page layout for record types t,u,v,w, specifically for Users on Profile A. Remove the Edit button from the page layout. Mark all the fields on the page layout as Read Only to mimic a read only page. Assign it to the Users from Department A. This is based on the assumption here is that the Users from Department A are on different profile than Users from Department B.