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Remove a challenge NOT purchased

hi how do I remove a challenge from my calendar? I've looked at the other responses, nothing is showing up as purchased because I'm FB Plus member, I just see a list of the challenges I've chosen and when I choose one there's no option to delete anything when I scroll down. there are only options to add it to the calendar.

I'm also on a smartphone, it would really be great to make this easier to do!

Edited