Try the following:
lxpanel>PCManFM>Edit>Preferences>General
Uncheck first box under 'Behavior' if you don't like single click.
I have been using a double-click action on the mouse for well over twenty years (Amiga, Mac, Wintendo, SunOS, Linux (KDE and Gnome).
Knoppix seems to want a single-click to open files and icons in the LXDE file manager.
I googled and tried to find the setting in preferences but cannot. I did see this very old thread - http://knoppix.net/forum/threads/457...on-desktop-etc. - but the solution doesn't seem to be relevant any more.
Any help?
Try the following:
lxpanel>PCManFM>Edit>Preferences>General
Uncheck first box under 'Behavior' if you don't like single click.
Ubiquiti Unifi US-48-750W Rack-Mounted Network Switch C Grade Condition
$249.99
*NEW* Dell EMC X1018 16 Port Gigabit Switch
$59.99
Dell X1018 X-Series Smart Managed Switches 16-Port Gigabit 2-Port SFP Switch
$45.00
HPE ARUBA 2530-24G J9773A PoE+ 24-PORT GIGABIT ETHERNET SWITCH J9773-60201
$81.21
NETGEAR 8-Port Gigabit Ethernet Unmanaged Switch Sz 9" L x 7.5" H x 2" W, Black
$11.20
NETGEAR 8-Port Gigabit Ethernet Unmanaged Switch (GS308) Home/Office Network Hub
$36.86
5 Port PoE Power Over Ethernet Switch NEW AMPS5E4P-At-65
$23.24
Cisco Catalyst WS-C3560CG-8PC-S 8x Gigabit PoE+ RJ45 Ethernet Switch
$64.99
Dell Networking N4000 Series 24-Port 10GbE SFP Switch N4032F Dual PSU DPS-460KB
$129.00
Fortinet FortiSwitch FS-124D-POE 24 Port Gigabit Ethernet Switch UNREGISTERED
$89.97