On a board that tries to visualise a lot of connections it gets messy, and actual connection are very hard to track.
Suggestion: when selecting the element - highlight the connections - make them more visible. Something like this:
Highlight connections when item is selected
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Or add a switch/ toggle to make connecting lines invisible, and have them show upon selection of a connected shape.
https://community.miro.com/wish-list-32/highlight-connecting-lines-when-hovering-the-cursor-to-show-how-objects-are-related-2847