Hi Kirti,
You can’t do SSO kinds of stuff on the default login page. Instead, you could do that with a new customized page. For that,
Step1:
Create a new page and give the page URL as /SSO. (You can get the page URL option in the Page property) Just refer given below image.
Step2:
Just add newly created a page on the default home page and authentication place in the app navigation setting.
Hope it helps!
Regards,
Yasar