By default, the platform does not have this option. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
.bp-user .bp-navs ul li.selected a,
.bp-user nav#object-nav .selected > a {
border-bottom-color: green;
color: green;
}
.bp-user .bp-navs ul li a:hover,
.bp-user nav#object-nav a:hover,
.bp-user .buddypress-wrap .bp-navs li:not(.current) a:hover,
.bp-user .buddypress-wrap .bp-navs li:not(.selected) a:hover {
color: green;
}
4. Save changes.
Screenshot
Timeline is the active link while Profile is the hover color.