The indicator displays the list of devices in the menu - you can click on any of them to set it as the primary device, on which information will be displayed directly on the panel of your operating system.
With settings you can set an alias for each disk, choose the color of the icons on the toolbar or to set the threshold for warning (when free space reaches a selected threshold, a warning is displayed).
Other features include the option to display space usage on the recently connected devices through alerts, as well as the option to run SpaceView at system startup.
After changing any settings in the settings SpaceView click "Restart now", otherwise they will not be accepted until you restart the indicator.
Installation latest version into Linux Mint:
sudo add-apt-repository ppa:vlijm/spaceview sudo apt update sudo apt install spaceview
Or you can download the DEB package and install it tmanually.