Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Is there a way to remove the `Sign Up` button without completely adding in my own UI?

Not yet but it has been added to the back-log. <https://ory-community.slack.com/archives/C010F7Z4XM1/p1697194048802149|See the following thread>.