Can you throw away (or trash) the wooden crates that you've built?

Yes you can throw them out. Enter build mode. switch to furniture mode (make sure ur in furniture mode and not shelter mode) while in furniture mode click on the crate you want to delete. Make sure crate is empty when u click on crate you should get 3 options. delete is the red x. Put back into your pocket is the green hand. and move crate which is the green arrows. You want the ❌ to delete crates