As mentioned in the original link.
- Pinned elements are not pinned on your mobile site.
If you are wanting something to be shown on mobile only, then use formFactor() function as shown here.
https://www.wix.com/corvid/reference/wix-window.html#formFactor
https://support.wix.com/en/article/corvid-writing-code-that-only-runs-on-mobile-devices
https://support.wix.com/en/article/corvid-tutorial-displaying-elements-in-mobile-only
For a floating/sticky header, then see the Corvid example here.
https://www.wix.com/corvid/example/sticky-header
Or do it through the Wix Editor settings itself.
https://support.wix.com/en/article/wix-editor-changing-the-header-scroll-settings
Old post being closed, open a new post if more help is required.