Ah, got it! This is not easy to spot at all, but the sidebar floating group’s height is not equal to the page’s full height, which causes the sidebar floating group not to display. The page may have significantly increased in size when the mobile-friendly data table was added, causing the floating group to become too short for Bubble to make it visible.
The current best way to fix this is to manually resize all sidebars when a page’s height increases so that they always extend to the bottom of the page in the editor. Here is a quick screenshot of where it is being cut off:
In regards to navigating a user to your onboarding page after they enter an email and password, this can be done by modifying the workflow of the continue button within the “Group Sign up step # 1” in the signup/login reusable element.