Sony WH-1000XM4/S Help Manual page 16

Put your hand inside the earpad of the left unit
Put the headset up and put it in a bag, etc.
Put the headset up and hang it on a bag, etc.
When you wear the headset with your face up or down as shown below, or when you wear the headset upside down, wearing
detection may not work properly, and the touch sensor control panel and CUSTOM button may not be available for operation.
Wear the headset correctly while facing forward, or press the
Wearing the headset while lying down or with your face up
Wearing the headset with your face down
(power) button briefly.
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