Hello @blijevlinders,
We apologize in advance for our delay in responding.
Do you mean you are using the Vintina Template Kit?
If so, we want to make sure what theme are you using? You can check it in the Appearance -> Themes menu.

If you use a theme that uses the Full Site Editing (FSE) concept, such as Twenty Twenty-Two or Twenty Twenty-Three, we hope you can change it to a non-FSE theme. We recommend you use the Hello Elementor theme if you don’t have a specific theme.
Once you are using a non-FSE theme, you can configure your menu in the Appearance -> Menus menu. For more details, please see the image below. You can create your menu first, after that you can reconfigure the Menu widget in Elementor. There should already be a menu list that appears after you create a menu.


Previously there was a forum that had discussions about the menu as well. Maybe the forum can help you understand better about our previous explanation. You can check the forum with the link below.
https://wordpress.org/support/topic/jkit-nav-menu-not-working-properly/
https://wordpress.org/support/topic/we-have-an-issue-with-the-hamburger-menu/
We hope our answers help.
Thank You
Hello @blijevlinders,
How are you? We haven’t heard of it in a long time.
Is the menu problem still happening to you??
Since there hasn’t been a conversation in this forum for a long time, we’ll mark this topic as resolved.
If you have other problems, feel free to create a new topic.
Thank You