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 i5-12600K Desktop Processor 10 (6P+4E) Cores up to 4.9 GHz Unloc...
$250.99
Intel Core i9-12900KF Unlocked Desktop Processor
$399.99
AMD - Ryzen 5 5600X 4th Gen 6-core, 12-threads Unlocked Desktop Processor Wit...
$169.00
AMD - Ryzen 5 5500 3.6 GHz Six-Core AM4 Processor - Black
$99.00
AMD Ryzen 7 5700X 8-core 16-thread Desktop Processor without cooler
$179.00
AMD - Ryzen 5 4500 3.6 GHz Six-Core AM4 Processor - Black
$79.00
Intel - Core i9-13900K 13th Gen 24 cores 8 P-cores + 16 E-cores 36M Cache, 3 ...
$579.99
Intel - Core i9-12900K Desktop Processor 16 (8P+8E) Cores up to 5.2 GHz Unloc...
$549.99
11th Gen Intel 6-Core i5-11400 2.6GHz with Turbo Boost up to 4.4GHz Processor
$125.00
Intel Core i5-12400 DESKTOP processor 2.5Ghz TURBO 4.40Ghz SRL5Y CM8071504650608
$149.00