Ok I've found a way to hide the social buttons and the call to action button (although I don't understand why the call to action button disappeared too, but I'm happy with that)
for anyone interested:
#collection-62b5d23448db021d6f6b48e3{
.header-actions-action, .header-actions-action--social{
display: none !important;
}
Haven't found solution to the rest yet, I will keep searching, hope someone can send me into the right direction:
how to change header menu text size and link space for 1 page only
how to swap 2 blocks within a section on mobile view
how to have a scroll up floating button
Thanks in advance,
Cheers
Patrick