Stop navigation menu from stacking

Site URL: https://remarkablesfit.squarespace.com/

My navigation menu keeps on stacking even though there is plenty of room for it to be all on one line. Using 7.1, and I have tried changing the element spacing in the header as well as css from some of the solutions posted here. None of them seem to work.

Any thoughts on how to fix this?

Site PW is RF2021

16 minutes ago, jenq said:

Site URL: https://remarkablesfit.squarespace.com/

My navigation menu keeps on stacking even though there is plenty of room for it to be all on one line. Using 7.1, and I have tried changing the element spacing in the header as well as css from some of the solutions posted here. None of them seem to work.

Any thoughts on how to fix this?

Site PW is RF2021

try

.header-layout-nav-center .header-nav {
    width: 80%;
    text-align: center;
    flex: 1 1 80%;
}

10 minutes ago, bangank36 said:

try

.header-layout-nav-center .header-nav {
    width: 80%;
    text-align: center;
    flex: 1 1 80%;
}

Thanks, unfortunately it still stacks a bit and takes it off centre to the left (see attached). For now, I have changed the style so that the nav is aligned to the right near to the box. This seems to look a bit more natural.