To close a channel, just close the channel on your Umbrel using Thunderhub or Umbrel's interface. No need to do anything here, nor do you need to create an invoice.
Thanks, but I don't have that option in either ThunderHub v 0.12.31 or Umbrel v 0.4.13. Attached is a screenshot from ThunderHub but the Swap ID does not match the Swap ID on LN+(see below) and the only option I have is to delete (BTW ThunderHub has never run that well, it is also missing quite a few stats, and has never displayed all the information even though I have run through the settings)
LN+ Agreement ID: 6553 was created on January 29, 2022 by Terra Australis. LN+ Agreement ID: 8990 was created on May 16, 2022 by Terra Australis.
Oh, you mean you want to delete the swap, not the channel? I misunderstood. I don't delete old ones. But I will automatically hide them perhaps. Good thinking!