Hi there!

Thanks for reaching out to us.

Are you using a predefined header?

Then you need custom CSS to achieve that. Here is sample code for you to reduce the menu item gaps and font size, so that it helps to remain in the same line:

.sp-megamenu-parent>li>a, .sp-megamenu-parent>li>span {
    padding: 0 8px;
    font-size: 14px;
}

Here is all about custom code placement in Helix Ultimate: https://www.joomshaper.com/documentation/helix-framework/custom-code-css-js-meta

Best Regards