Page layouts are used to organize the display of fields, buttons, custom links, inline Visualforce pages, Report Charts, and related lists on an object detail or edit page. They are used to establish unique layouts for different business scenarios.
The displayed fields within a related list are controlled by the page layout; the name of the related list is determined by the lookup/master-detail relationship on the related object.
Page layouts are comprised of sections that contain buttons, fields, related lists, and customer links that can be edited using the enhanced page layout editor, as shown in the following screenshot. Here, we are showing how we can edit the properties of the Account Site field.
Within the field sections, the user interface can be used to make a field required or read-only, as shown in the following screenshot:
The enhanced page layout editor showing read-only settings, as indicated with the padlock icons, is shown in the following screenshot:
