I had a look at the interface, but indeed couldn't fine a way to delete a source. I only found a way to "disable" it which allows you to re-enable it later.
I suggest reaching out to support. It might be a manual process.
Thank you for your reply, I've found a way!
I don't know if the support made a change after I"ve sent them my question, But: when the source is active, there is an EDIT button in front of "Configuration" while scrolling down to the page!
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