THANK YOU Tuan for resolving this issue! See attached screen shot of the updated nav menu in vertical/stacked format. For anyone needing the same change, below is the code and you can also find it here: https://summaryblock.com/save-code/139-2/
nav.Header-nav.Header-nav--secondary>div {
flex-direction: column !important;
display: flex;
}
nav.Header-nav.Header-nav--secondary {
padding-top: 7px !important;
}
nav.Header-nav.Header-nav--secondary a.Header-nav-item {
padding-bottom: 3px !important;
padding-top: 3px !important;
}
