Different brands of TVs have different paths to open the CEC. Please check if your TV supports the CEC function first.
Once it is on, you can control the soundbar's on/off and volume at the same time through the TV remote control. But only for HDMI connection;
Other connections such as OPT, BT, AUX, and USB do not technically support the HDMI CEC function, so you must use the soundbar remote control to operate the volume and EQ.
Setting: Please turn on the CEC of the TV.
For example: Samsung