dougj Hi
It's defined by this css rule in template:
.t4-megamenu .navbar-nav > li > a, .t4-megamenu .navbar-nav > li > .nav-link {
color: var(--mainnav-link-color);
font-size: 0.875rem;
font-weight: 500;
padding: 20px 1rem;
height: 80px;
line-height: 40px;
-webkit-transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
text-transform: uppercase;
}
You can override with this custom css:
.t4-megamenu .navbar-nav > li > a,
.t4-megamenu .navbar-nav > li > .nav-link {
font-size: 0.875rem !important;
font-weight: 500 !important;
}