Well I am not sure if it's a bug software or UI design bug but I have a lot of problems removing things in ship design vew when creating new design .
Mostly it's a problems with selecting things I wish to remove on ship view but sometimes the "Remove" button just wan't work at all.
Actually I thinkj there is also logical error with selecting things on ship design view - if you click on the item (on ship) you never know if it will select the item or put the new one selected on the left in.
And there is some mess with puting new items too - sometimes you need 1 click , sometimes doubleclick , sometimes item selected drawn at place where you can put when you hover over with mouse , sometimes not.
I think someone at stardock should recheck entire screen.