Oversized sound control in chat window widget

In the logged-in mode only, and at the front page (Activity) only, the WP-Chat widget proudly presents huuuuge sound control, which I actually do not want. See screenshot. I searched the Q&As -- no result. For next two weeks (till my nnew computer arrives) I can hardly do the plugins switch on/off game as my current laptop gets stuck (1 G RAM/Pentium Thinkpad x40). So, please forgive me not going through the troubleshooting scheme.