Hello,

If I give you CSS to make the menu scrollable you would not be able to show mega menu blocks, as it is not possible to have a scroll and mega menu at the same time.

Please consider showing part of the categories or showing all without mega menu. By the way, you can insert the mega menu HTML block in the category description and show it in the category page: https://xtemos.com/docs/woodmart/html-blocks-2/#cat_att_tag

Here is the CSS to make the scroll:

body .wd-dropdown.wd-dropdown-cats {
 max-height:470px;
 overflow-y: auto;
}

Best Regards