Yes, it's possible but may be a little bit tricky. It's enough to set menu container to position: fixed and set top margin so it won't hide under also fixed top bar.
BUT, you need to remember that Socialize has responsive design. That means menu will change into dropdown button and menu will be dropped after click. If you'll have a lot menu items or sub menus in menu then it will be "high" enough to move out the viewport... poart of menu will be not visible under viewport edge... and as position of menu container is fixed - you'll not able to scroll it down to see the rest of menu items. So having fixed menu in mobile view is a really bad idea.
But also this could be solved using display breakpoints and define position: fixed only for viewport larger than 1024px and position: relative for viewport that will be smaller than 1024px.
I'm sorry but I can't give you detailed instruction or ready code - in cases of extensive customization or layout changes we don't provide support as we'll be obligated to maintain those changes.
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