Yeah I couldn’t figure out how to delete a feed either. It seems like they can only be unchecked.
As far as I know, adding/enabling a feed doesn’t mean you technically follow the users in that feed. You just see their notes. So disabling the feed should achieve your goal I think.
Maybe nostr:nprofile1qqsdv8emcke7k3qqaldwv956tstu40ejg663gdsaayuuujs6pknw7jsprpmhxue69uhhqun9d45h2mfwwpexjmtpdshxuet5qyf8wumn8ghj7ur4wfcxcetsv9njuetn05794w nostr:nprofile1qqs9xtvrphl7p8qnua0gk9zusft33lqjkqqr7cwkr6g8wusu0lle8jcprpmhxue69uhhqun9d45h2mfwwpexjmtpdshxuet5qyt8wumn8ghj7un9d3shjtnwdaehgu3wvfskueqdmqx6a nostr:nprofile1qqsgqke57uygxl0m8elstq26c4mq2erz3dvdtgxwswwvhdh0xcs04scpz3mhxue69uhhyetvv9ujuerpd46hxtnfduq3vamnwvaz7tmjv4kxz7fwwpexjmtpdshxuet5d3qm3h can verify.

