How to turn off Earfun Air Pro 4 earbuds without case?

The earbuds will remain on as long as they are connected to a device. If no audio is in use, they will enter into power-saving mode and wake up once audio is played. If the earbuds are not connected with any devices, they will automatically shut off in 10 minutes. You can manually turn it on by long pressing the earbuds.

Hello,

is it possible to store them in the case without them being charged, basically turned off? Meaning that if I wanna store them long term inside the case they're not kept to 100% for long periods. This keeps the battery in the case and on the buds healthy.

Long pressing only turns on noise cancellation and does not power off the earbud.  Even in the controls (on the app), it doesn't show a function allowing the earbud to be turned off.  Very frustrating, how can I manually turn off a single earbud I do not wear both at the  same time.