Note: SSO integration is not available at all service levels. If you do not see Single Sign On Settings under your Account Settings, and you are interested in the integration, please contact firstname.lastname@example.org to discuss having it added to your account.
Single Sign On is commonly activated to securely allow the onboarding of employees to the library, utilizing an Identify Provider (IDP) such as Azure or OneLogin..
The welcome message and button description can be edited by the Master Admin under Admin> Account Settings> Single Sign On Settings
You may even choose to hide the SSO button in the rarer cases where you have integrated Image Relay to an internal portal page and only allow direct links.