How can I hide a subtab using Application Composer?

You can hide a subtab from the Pages option of an object in Application Composer.

Navigate to Application Composer and do the following:

1. Expand the object that contains the subtab.
2. Click Pages.
3. In the Application Pages tab, edit the duplicated or copied Details Page Layout.
4. Click the Hide, Show, or Reorder subtabs icon in the Subtabs Region section.
5. In the Configure Subtabs window, remove the subtab you want to hide from the Selected Subtabs list.
6. Click OK and then click Done.