I configured it at the beginning and it appears on the Branding>Universal Login page of my tenant.
However, after I finished the tutorial for API configuration and integrated it with my client side. The universal login page changed its appearance to this:
The universal login page displayed on the redirect does not match the template displayed on the Branding > Universal Login > Quick Start and Branding > Universal Login > Customization Options pages.
Suppose I create a new user. Everything is working as expected until you open the Customization Options page. But at the very beginning, you can revert changes at the time.
Looks like the primary solution is to delete and create a new tenant or account, but for now I do not want to do this and want to solve this problem with the existing ones.
So, since no one answered and did not provide any other solutions, I just deleted the existing tenant and created a new one. Then I just updated credentials in local applications.
To not break the view of the universal login page, I just made a few adjustments on the Universal Login > Quick Start section and nothing more.
If I update the view on the Universal Login > Customization Options page, the universal login appearance can change in an “old manner” as I highlighted above. And it looks like a bug to me as a user.
That’s odd behavior for the root functionality of such a service.
However, I hope this behavior won’t reproduce when I start working on adding terms and conditions from this topic wrote by @lihua.zhang that seems to include the appearance customization.