Back to Members:
Once you join the Zoom meeting, look for the globe icon (you may need to click ... or more to see it). Note the icon may not appear until the meeting host has assigned a intepreter. See the screenshot below.
By default, you will hear the interpreter's audio (when he/she is speaking) PLUS the original audio in a lower volume. When you do not want the original audio (e.g. to follow the interpreter for singing in own language), you may choose Mute Original Audio to turn it off.