The little trash can in the lower right works for me.
Thanks, works indeed. I didn't recognise this as a trash can. I thought its the scroll down botton.
Just noticed another issue. If i return from the Ship-build dialog (Or any other sub-menu) i have a delay of roughly 2 seconds, bevore i am back on the main screen...rather annoying. Especiall if you click twice (alyways do it, cant help myself, so used to instantly responding bottons) the menu will pop up, once i reach the main screen. If the delay is unavoidable, they should make at least introduce a black-screen as transtition, so you know that somehting is happening.