I attached the keybind I proposed to be added to the /etc/xdg/openbox/LXDE/rc.xml file.
--- /etc/xdg/openbox/LXDE/rc.xml 2017-01-21 00:09:24.000000000 +0100 +++ new.xml 2020-06-04 22:22:44.763240643 +0200 @@ -310,6 +310,44 @@ <keybind key="XF86Display"> <action name="Execute"><command>lxrandr</command></action> </keybind> + + <!-- Put a window into a half screen --> + <keybind key="W-Left"> + <action name="Unmaximize" /> + <action name="MoveResizeTo"> + <x>0</x> + <y>0</y> + <width>50%</width> + <height>100%</height> + </action> + </keybind> + <keybind key="W-Right"> + <action name="Unmaximize" /> + <action name="MoveResizeTo"> + <x>-0</x> + <y>0</y> + <width>50%</width> + <height>100%</height> + </action> + </keybind> + <keybind key="W-Up"> + <action name="Unmaximize" /> + <action name="MoveResizeTo"> + <x>0</x> + <y>0</y> + <width>100%</width> + <height>50%</height> + </action> + </keybind> + <keybind key="W-Down"> + <action name="Unmaximize" /> + <action name="MoveResizeTo"> + <x>0</x> + <y>-0</y> + <width>100%</width> + <height>50%</height> + </action> + </keybind> </keyboard>