This is a weird one. There's no build bar when I'm playing the Galactic War, but there is a build bar when I'm playing multiplayer.
mods? EDIT: Also not really weird, there is special stuff going on in gw to make it only list a limited selection of stuff.
Did you tried to move cursor to bottom of screen where build bar should appear? I have glitch like that on Linux and it's looks like Coherent doesn't load bottom bar for some reason, but once I move cursor down it's appear.
Also, keyboard shortcuts to build things don't even work. None of my mods alter the build bar. I did move my mouse down there and clicking around. Nothing happened.
do you have any mods affecting build list for gw, like loadouts or cards? I say that, because no build bar often means bad syntax in build list, erroring it entirely.
I disabled all mods and it's working again. So it seems there's a mod conflict. I'll try and figure out which after I play this match.