As per your response,
1) Keep the button label (currently “Reserve the spot”) as a parameter of shortcoode..
Ans – Done

2) After the user submits successfully, the “Leave Check” screen should not show up again.
Ans – Done

3) In Elementor, how can we put extensive information only on the left-hand side without having it get in the way of the sticky content on the right-hand side?
Ans – This page is designed with the Elementor so first you need to take two columns i.e. (70% + 30%). Means 70% area for left side and 30% area from right hand side.

Now you need to add all the content in the left side area. Put our shortcode in the right side area so no content will come under it.

4) Still in Elementor: how can we keep the brief text content below the red button and have both the button and the text content be sticky?
Ans – You can easily add the content below the button means our shortcode. Once you approve to devide the page then I will make it sticky in the desktop as well.

Thank you for the update. We have tested this page, on the desktop view the red button area is not sticky. We tested via Firefox and Chrome. Please ensure that the contents in this box (button + text message) are sticky on both mobile and desktop views.: https://app.screencast.com/WneohaXgKk4I1

Please advise on the questions below based on this screencap: https://app.screencast.com/BDIIcOjV0MviJ

1.) In Elementor, how can we put extensive information only on the left-hand side without having it get in the way of the sticky content on the right-hand side?
2.) Still in Elementor: how can we keep the brief text content below the red button and have both the button and the text content be sticky?

To emphasize our point, please refer to the Eventbrite example, there will be nothing below the sticky area: https://www.eventbrite.com/e/career-fair-exclusive-tech-hiring-event-tickets-63168789550?aff=ehometext

As per our discussion on Skype, I have done your chnages. Please take a look at https://dev.fivebranches.edu/event/02-19-2023-santa-cruz-onsite-dtcm-mtcm-open-house/

Note : Kindly check with hard refresh (Ctrl + F5) or removing the browser as well as site cache.

I have created one shortcode for this to achieve this,
[wpos_event_sing_up cta_btn_text=”Reserve a spot”][gravityform id="2" title="false" description="true" ajax="true"][/wpos_event_sing_up]

Once you check it, then need to add it in all events.

Please let me know if there is anything. I am here to help you.