How do I safely remove the USB stick on openatv 7.5.1?

I installed openatv 7.5.1 on my AMIKO Viper 4K and I can't find the option to safely remove a USB stick. Before I had openatv 6.4 and I pressed the blue key,mounts, device mounts and unmount.

The following options appear for me in 7.5.1, although I have the USB stick in the receiver, I do not have the option to safely remove it.