UML in IntelliJ IDEA?

Question

IntelliJ IDEA

Hello.
I recently got out of the world of microcontrollers and took up Java, now I am writing the core of a small engine and have already begun to get lost in classes and relationships (Moreover, I am learning OOP templates along the way). I think if you sometimes look at class interaction diagrams, it will be a little easier, but I can’t create these same diagrams - there are no menu items, then what is written on the off site video does not fit the CE version. I installed plugins, but everything crashes with them, is there any alternative? Is it possible for a third-party application to see the relationships between classes?