@texasEE, lxqt’s auto mount is controlled thru pcmanfm, you can either go into pcmanfm’s settings and configure it or edit:
~/.config/pcmanfm-qt/lxqt/settings.conf
and change any of these options to “true” to get the functionality you want…
CloseOnUnmount=false
MountOnStartup=false
MountRemovable=false
Make sure to reboot after each change…
Regards,