Hi there,
Thanks for writing in! This can be done with custom CSS, try adding the following code in the Theme Options > CSS:
.x-navbar .desktop .x-nav > li > a:hover, .x-navbar .desktop .x-nav > .x-active > a, .x-navbar .desktop .x-nav > .current-menu-item > a {
box-shadow: none !important;
}
.x-navbar .desktop .x-nav > li > a:hover span, .x-navbar .desktop .x-nav > .x-active > a span, .x-navbar .desktop .x-nav > .current-menu-item > a span {
border-bottom: 4px solid #4bacc6;
}
If you would like to learn CSS, I am sharing few resources that you take a look to get started with CSS and an interesting tool that you can use to speed up the development process.
I recommend you to watch following video that will help you to get started with CSS.
https://www.youtube.com/watch?v=MFR4WXiLzpc
Sometimes it can get a bit difficult to find out the right selector to be able to write the required CSS codes. A handy tool that can help you in this is Google Chrome dev tools. I am sharing the resource that you can refer to get started with dev tools.
https://developers.google.com/web/tools/chrome-devtools/css/
https://developers.google.com/web/tools/chrome-devtools/
https://www.youtube.com/watch?v=tP_kXBJWPhQ&t=200s
Hope this helps!