Another type of flow that we can create is a Login Flow. We use our Example Flow, which was a screen flow, and associate that with a Login Flow for users in the President Profile.
To test this out, you’ll need to update the User Account for Allison President to have that user account associated with an email address that you control. You can then click through to confirm the email address change. You will then be logged in as her and should see the Login Flow.
Do not associate the Login Flow with your own Profile. Be sure you associate this with another user, such as Allison President.
Login Flow Examples - https://help.salesforce.com/articleView?err=1&id=security_login_flow_examples.htm&type=5