Hi NeonWhite,
Usually when I'm struggling with removing dependencies I add Table to Solution and from there I have easy access to "Show dependencies" , this is final screen you should be seeing, from there you can navigate to appropriate sections.

Also you can use Old Dynamics Advanced View.
1) On Top Left part of the screen Click the cog Icon
2) Advanced Settings
3) Customization Column -> Solutions (assuming youve already pulled your table into ANY solution
4) Click on your solution
5) Find your Table (it will be called Entity)
6) Find relationships
7) click on relationship you want to remove, try to delete

If you having trouble with solution and adding tables I've created a video on the topic, should help:
https://youtu.be/VocB6AC5fRU
Tell me if it helped and provide a screenshot with relationships of your entity,
If it doesn't help at all it would be useful to recreate those relationships then If you'll provide me the steps I can try to remove them myself.
BR
Zbigniew