/etc/xdg/xdg-Lubuntu/lxqt/lxqt.conf is in lubuntu-default-settings 0.54.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [General]
icon_theme=Papirus-Dark
theme=Lubuntu Arc
single_click_activate=false
tool_button_style=ToolButtonTextBesideIcon
[Mouse]
cursor_theme=DMZ-White
[Qt]
font="Ubuntu,11,-1,5,50,0,0,0,0,0"
style=Breeze
doubleClickInterval=400
wheelScrollLines=3
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