Relations of present subjects in lecture

[Bluerberry]

In highly connected graphs, the present subjects of a lecture might have overlapping relations. Currently ive disabled these relations, but some lecturers might want to display them. Solutions include:

Toggleable setting in graph settings to show lecture relations
horizontally space out relations as to not overlap
honestly, there are at the very maximum 10 subjects per lecture, I could just brute force all permutations and find the least overlapping relations