Expected Behavior
There should be a way to show volumes/partitions on the --desktop view, like they already show up under "Devices" in the side panel of the the file manager.
Most desktops allow this. E.g., Xfce:

Current Behavior
Volumes/partitions cannot be shown in the --desktop view.
System Information
- Distribution & Version: FreeBSD 12.1-RELEASE-p8
- Kernel: FreeBSD 12.1-RELEASE-p8
- pcmanfm-qt Version: 0.15.0