IOS and app, latest versions of everything.
In landscape mode, swiping left on a Discourse site (at the main list of sites you’ve configured) reveals the red delete box but the trash icon is centered full-width so you cannot tap.
The “trash area” is under (z height) the site name, but seems to be full width. Try swiping farther with just the right speed and you can catch a glimpse of the trash icon.
Works fine if one simply rotates to portrait.