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.
Intel - Core i7-12700K Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unloc...
$419.99
Intel Xeon E5-2697A V4 2.6GHz CPU Processor 16-Core Socket LGA2011 SR2K1
$39.99
Intel - Core i9-12900K Desktop Processor 16 (8P+8E) Cores up to 5.2 GHz Unloc...
$619.99
Intel Core i5-4590 Quad-Core 3.30GHz LGA1150 Desktop Processor CPU SR1QJ
$12.95
Intel Core i7-6700 3.40 GHz QUAD Core (4 Core) Desktop Processor 8MB LGA 1151
$59.99
Intel Core i5-6500 3.2GHz Quad-Core SR2L6 CPU Processor
$24.00
Intel Core i5-8500 Six Core Desktop PC CPU Processor 3.00GHz LGA1151 SR3XE
$49.99
Intel 16 Core i7-13700T DESKTOP processor TURBO Boost 4.90Ghz CM8071504820903
$269.00
[Lot Of 6] Intel Core i7-9700T SRG17 Coffee Lake 8-Core Max 4.3 GHz LGA1151 CPU
$719.94