Adjust Bixby Voice's volume level
Adjust Bixby Voice's volume level
Adjust Bixby’s volume

There are many ways to adjust Bixby Voice's volume. The most convenient way may be to press the Volume up or Volume down buttons. Then, tap the three horizontal dots at the top of the Volume pop-up menu, and use the slider to set the volume.
From this menu, you can also tap the Settings icon to open Volume settings and adjust it from there.
Alternatively, you can launch Bixby using the Bixby button or Side button. When the Bixby pop-up menu appears, press the Volume up or Volume down buttons to adjust Bixby Voice's volume. You can also ask Bixby to do it for you. Just wake up Bixby, and then say a command, such as "Set Bixby Volume to 50 percent."
Contact Samsung Support