Running LibreELEC (Leia) v8.90.004 on RPi 3.
In "File Manager", I cannot get a context menu for a mounted USB memory device. In previous released versions this context menu provided the "remove safely" option, allowing the USB device to be removed, and taking it out of the list of sources. I have tried with both a keyboard/mouse and an "air mouse". Neither option gives the context menu.
I think that the following item in Kodi's forum is related to this problem:
#17978 (Not able to unmount udisks2-mounted devices) – Kodi - TRAC
However, understanding the response is beyond my technical capabilities, and I think it is an LE issue.
Regards,
Jon