Header in 3 columns format

You can edit header.php of your theme and try to do your changes or use a plugin such as UberMenu (paid) to make this hapen.

If you want to try to change it by yourself, here is some snipped code that can help you: https://www.w3schools.com/howto/howto_css_three_columns.asp

See also this: https://codex.ww.wp.xz.cn/Function_Reference/register_nav_menu