this issue was submitted to the support team Request #116584 and they guided me to the idea center.
we are facing an issue inside the modeler about Tab container, the issue is that not all tabs are shown some of them are hiding as attached
* The Idea to solve this issue by adding “more button” to show the remaining items that not shown
Have a look at the Tab extensions widget (https://marketplace.mendix.com/link/component/894) Maybe it satisfies your needs.
i think its better to display remaining tabs as drop dwon list after certain space.