Hey Ege,
Regretfully, menu dividers is currently not offered in Pro. Since you’re also using a third party plugin, you need to contact the plugin author if he can give you the CSS for the menu divider.
If you’re using the Navigation Inline element, you can follow this custom setup at https://youtu.be/oVl2NV-oeqY
Below is the code in that setup but please just note that this is outside the scope of our support. The reason why I provided the custom solution is to help you get started. We will not support issue that might arise from the use of any custom code and further enhancements. For that, you will either need to consult with a third party developer or you should learn CSS.
.x-menu-inline > .menu-item:after {
content: "•";
line-height: 3;
}
.x-menu-inline > .menu-item:last-child:after {
content: "";
}
Thanks.