There are supposed to some checkboxes for a filter of cargo on the ship, in the store, or both, and they are obscured behind the cargo table. GOF 2.0 and 2.5 are full of bugs from the original mod and once the teams disbanded, none of them got fixed. GOF 1.2 is the best one because I have fixed most of the bugs in that mod, but I have not hardly looked at 2.0 and 2.5. Anyway, since you brought this one to my attention, I just updated 2.0 and 2.5 to fix the store filters so you can see them. Click them to change what items are displayed to help decide which to sell/buy.