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Animations with the following website! Please help!

Hi,

As I scroll up the page, I would like the ‘Become A New Patient’ button to scroll out of view and the sticky menu to move down into view which I think works pretty well.

On scrolling down, however, I would like the sticky menu on top to disappear(just have the navigation menu) and the ‘Become a new patient’ button at the right position, but looks like I’m pretty confused on how this is to be done.
Can anyone please help and explain to me what I’m doing wrong here?

[Webflow - CCAP Clinic]