Has it suddenly shrunk? This issue was affecting quite a few of us. Partner board got so small it was impossible to play. Switching to beta has fixed it for me, though I know they were rolling out a fix. If it's not that and you just want to resize the boards in general then I've no idea
Is there a way to make partner board bigger?

Not yet. We have some distant plans to create some improvements here for bughouse.
Sorry for resurecting an old, dead thread but how "distant" are these plans?
Equal-size player and team member boards would be a HUGE improvement. I could see move lists going on respective sides, and boards of equal size sandwiched between being an optimal solution. Adjust whichever view based on personal user preferences (pieces exchanged, board orientation, move lists, etc).
I mean to say: We have Bughouse tournaments. Why is our team member's board off in the corner in a quarter-sized view? When you play IRL, my team member's board next to me isn't 1/4 the size
Just saying.
Is there a way to make partner board bigger?