Auth flow using auth0-react and custom signup/login page

I am facing same problem that you are. We are going to build our own login flow including Passwordless login, OTP verification, Organisation login, etc. I end up to the solution with Auth0.js V9 + NextAuth. You can choose any session management tech you want, I use NextAuth to handle session on my client. I have read a lot of documentations that Auth0 recommend to use Universal Login page which really not fits for the production in business. All SDKs except Auth0.js are end up to call loginWithRedirect() function to engage Universal Login page as I know so far.

Hi Dawid,
Please help us out, how can we use our own FE lib to build our own pages for login flow rather than engaging Auth0 Universal Login page? Thanks.
P.S. As a user management platform, Auth0 should not dig into UI too much. Your SDKs for SPA, Regular Web App are all working as expected but please free us of UI staff.