Thank you so much to both of you !
Here are some more precisions about the way to do it :
1/ Each page has a specific collection number, so if you want to hide the navigation bar on a specific page, go on this page and find the page's collection number
2/ Replace the collection number in the following code by yours
#collection-5dcedd5eb702913cebc23c32 .Header-nav {
display: none!important;
}
3/ Insert the code in DESIGN > CUSTOM CSS
4/ If you need to hide your navigation bar on several pages, follow the first 3 steps for each page. Your custom CSS window will look like this
#collection-5dcd70869ea30043a7d107f7 .Header-nav {
display: none!important;
}
#collection-5dcd7c15efe0ea08ad8167ac .Header-nav {
display: none!important;
}
#collection-5dcedd5eb702913cebc23c32 .Header-nav {
display: none!important;
}
👋🏻