Currently the PA UI is incomplete. your build queue shows up as an (incomplete!) set of numbers representing what will come out but not in what order. FA had a panel come up when you selected a factory (kinda like we have now...)(but most importantly an incomplete factory)(we also already have that in PA btw) that contained all the orders you could give the factory including a list of things it can build (topmost); along with another scrollable list of things it contained in it's build queue (bottommost) (the first of which being the unit currently being built). on a 1920x1080 screen you'd see 28 items/units (with the sequential and identical ones grouped into 1 with a number on it for quantity, and you could even tech and queue up the things of the next tech) that you could 'select': But 'delete' was the only thing you could do from there. GAZ_UI added the possibility to click and drag them around to rearrange your build queue at leisure. currently in PA the two lists are fused into one and this is heavily handicapping for it's UI. basically in our fantasy UI (that you have to imagine) (and you better believe the UI is going to change because Garat and Neutrino said so a heckton of times) you'd select the engie from there (or whatever the PA newUI equivalent translates to).