Can't trim with Robin Cap 10, anyone has a POH for this model?

After more than 100 hours with 152/172/A320 NEO, I wanted to try something different in the standard version. When flying Robin Cap 10 in Japan yesterday, I found it’s not possible to adjust trim? Am I doing it wrong?
On xbox x, with Hotas one. I will try to adjust trim with keyboard & controller again. Plus does anyone have the POH for this model? I tried everywhere, but found nothing. I’ve collected a small collection of POHs with the models I’ve flied in the game (152/172/TBM 930/DA 40/208B/X CUB) and quite fun to read them.

Aerobatics trimflaps switch off?

Actually I have no idea what this function is. Will try tonight. Thanks!