i agree, i would like that too
Another dumb question--how to rewind partner board?

You have to go to your partner's profile and go to their archive. Then you click on each individual move on the board because arrow keys don't work.

after thhe game ends, u can take the bug game to the analyses section. There u would find a column named Partner. There, u can rewind ur partner's moves. I think chess.com haven't given that feature yet cause anyways, bughouse needs more space and we have to adjust to the small partner board. And bringing another column is just too much...
I'd like to see what happened to the partner's board and am not sure how to rewind the game? Like go back a few moves or go to the start of the game? All the controls just affect my board. This seems to be the case after the game is over too?