Hello,

I have seen your attachment. You are using a menu with larger quantity of items that’s why it did not fit in the particular space and goes outside the row. So to fix this there are multiple ways:

1) You can use a bit smaller font size for navigation from the Theme Settings >> TYPOGRAPHY >> Navigation font. But remember that this font also applied in your all the other navigations(menus).

2) I suggest you to decrease the menu items so the menu will fit in the available space in a row due to less number of items. You can do this from Appearance >> Menus.

3) You can use the following css code to make the font size of sticky header menu a little smaller, in Theme Settings >> Custom Css >> Global Custom Css:

.whb-sticky-header .menu-item a{
font-size:8px;
}

I used 8px just to set an example for you. You can use some other size.

In case none of the above solutions works for you then share your site login details. I will help you out.

Best Regards.