The '''Alternate '''tab from the Login Page list view is used to create and edit multiple custom login pages with a specific instance URL.
If you are on the '''Alternate''' tab When , when you click the '''New Login Page''' button that looks like a '''+''' icon in the action bar then you will create a New Alternate Login Page.
Alternate login pages work differently then Primary login pages, so you can’t reuse the code from the Primary login pages. Alternate login pages also require more customization and the users are required to enter a long url to use these