Also what is the maximum number of fields that can be used for this power up?
Is there a way that I can see all of the custom fields that I have used so far on the whole of my Trello site?
1) Yep
2) I think it's 100 or something, you run into this eventually if you move cards between boards a lot because when you move a card that has a value set on a custom field from one board to another, the fields are automatically created in then target board
3) Not natively ... although because it's Friday, here's a Trellinator command that would do it for all boards on which Trellinator is a member:
https://gist.github.com/iaindooley/7b62354b56b29f83dd9e53966abde246
You can read more about Trellinator here:
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