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Dropdown link in Nav bar list looks different

https://preview.webflow.com/preview/newyorkestonianhouse?utm_medium=preview_link&utm_source=designer&utm_content=newyorkestonianhouse&preview=cb812f7f055cf85a685e94d1ce58ad57&pageId=6088969f4c0f5035763739ea&mode=preview
I am looking gor help with my first website with WebFlow.
image|230x500

  1. Back to top arrow. I would like to make it visible on the half page and dissappear at the beginning of the page. I watched videos and everything. Cannot make it work. Can anyone help me with it?

  2. Nav bar- dropdown link looks good with big screen but landscape and cell- looks different. I checked typo and size - everything is same size and font.

Thank you!