@Juanito
Thanks you, it works!!!
BTW: in my Arch Linux + LXQt system, in winecfg Graphics tab, I have checked Allow the window manager to control the windows, and Allow the window manager to control the windows, too. The only tweak I need is to set the main LDmicro window (or another app windows) to go to the lower layer of LXQt, to avoid that pop-up windows (dialogs) being hided by the main window. Of course, LXQt and flwm are different beasts and them roar in very different modes
Last but not least: I can't switch my keyboard layout (latam > es > us) by means both Ctrl buttons. "grp:ctrls_toggle" in my 01-xorg.conf, replacing "grp:shifts_toggle", neither allows change keyboard layout. setxkbmap is the only way for this task...
Thanks you again.
Best regards,
DanielH