Can't find item to delete it

Principle Version: 6.11
macOS Version: 11.2.3
Description of what you need help with: There’s an item that won’t delete and I can’t figure out how to get rid of it. It’s not hiding in a layer underneath. Please see third screen, the first green checkmark slides in from the top. Nothing should happen to that checkmark.

.prd file link (we really need this to fix almost any problem): house-home_portfolio.mp4 - Google Drive

Could you please post a link to the prd? Impossible to know what’s going on without it