Hi Aijaz,
there isn’t a component property which allow you to display the dropdown menu horizontally instead of vertically.
You can try to apply some custom CSS.
In a small sample i have tried this CSS rule and works for me
.bts-extra-navbar ul > li {
display: inline-block;
}
However i can’t tell if will be a good fit in case you have many items in your submenus.
Regards,
Paolo