Hi, this is customization beyond what I can assist with. But, to give you a start, look at the code from Gridzone:
This is added in scripts.js of the theme: https://pastebin.com/raw/7mCtBQa7
Then add class=”hide-on-scroll-down” on the header element you want to hide on scroll-down.
After that, you need to add some CSS to make it disappear.
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