While it's easy to delete custom lists and titles within my watchlist, it appears impossible to delete a title from a custom list.
I'm using desktop version and there's a bin/trash icon beside each entry in your custom list, see this
Sometimes it takes a few minutes for a custom list to update. Are you Saving it after you've made your changes?
Hi. I think so. Sorry for the delayed response. Will make sure all changes are saved going forward. Thanks!