O, you mean this: https://sync-in.com/docs/setup-guide/server#oidc-if-provider-oidc-

autoRedirect : Automatically redirect to the IdP.
Default : false

Thank you very much, Johan

@johaven something to ponder upon:

• with autoRedirect: true, one is automatically directed to the OIDC issuerURL
• If - based upon, I suppose, cookies - the OIDC provider reckons the user status "loged in", then it automatically forwards to the client with the applicable user account credentials
• Thus, with a couple of flashes, we enter Sync-in with our proper account
• Perfect! This is what SSO should be about
• Next, Logout of Sync-in
• This leads to the Sync-in signin page (briefly)
• Which leads to the OIDC provider login page (briefly)
• Which takes us right back into Sync-in again
• One just cannot logout of Sync-in, or did I miss another vital piece of documentation?

This is the expected SSO behavior. Logging out of Sync-in only ends the local Sync-in session. The IdP session remains active, so with autoRedirect: true, the user is immediately authenticated again and redirected back into Sync-in. To completely sign out, the user must also log out from the IdP, which would also sign them out of the other SSO-enabled applications.