Low battery warning beep. High pitch engine noise

[KTFARAH]

Q 1 - Help please. I read with one of the DJI updates (not the latest) that we are able to mute the Low battery beeping sound. Could not figure it out. Any instructions?
Q 2 - Whne I fly on Tripod mode indoor with the prop guards installed, at times a high pitch / whistle enjoy noise is heard. Any feedback

Thank you

 

[rockydog]

You can only silence the beeping for the controller battery, not the Mavic battery.