How to Show or Hide Mounted Drives on Gnome Dock in Ubuntu
Hide Mounted Drives from Dock
# Hide Mounted Drives from Dock gsettings set org.gnome.shell.extensions.dash-to-dock show-mounts false
Show Mounted Drives on Dock
# Show Mounted Drives on Dock gsettings set org.gnome.shell.extensions.dash-to-dock show-mounts true