Organize main topics

I want to now how I can organize my main topics to don’t have trouble in the future searching for them.

Here I have 2 main topics. (red ones)

  1. One I releated to all my notes in that topic.
  2. And the other I only releated the main subtopics.

I like the first one because It’s big and I can see that is a main topic by far. But the second one likes me becouse it’s better for organize, I see all the subtopics and with that I can search for a espesific subtopic.

Maybe the solution would be if I can just make bigger only my main topic nodes but I don’t see anything like that. Im open to suggestions : )