By default, all the standard fields are displayed in each module's page layout. However, to
show or hide fields you can follow the steps given below:
To show fields

1. Log in to CRM with Administrator privileges.
2. Click Setup > Customization > Layouts.
3. In the Page Layout page, drag and drop the Field label from the Available Field List.
4. Click Save.

1. Log in to CRM with Administrator privileges.
2. Click Setup > Customization > Layouts.
3. In the Page Layout page, drag and drop the fields to the List of Removed Fields section.
4. Click Save.