How to "redecorate" windows?

Strangely, by default, there is no toggle to decorate/undecorate a window.

You need do one of two things. Either define a keybinding to toggle or use the shortcut key to redisplay the window menu.

Lets examine option 1:

To do this, open lxterminal

leafpad ~/.config/openbox/lubuntu-rc.xml

Search for the first instance of <keybinding>

Then add the following keybinding:

<keybind key="W-A-D">

<action name="ToggleDecorations"></action>

</keybind>

Now run openbox --reconfigure to make your changes effective (alternatively, you can logout and login).

You'll be able to toggle the decoration using Meta+Alt+D

The windows key is also another name for Meta

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Lets also examine option 2:

Thanks to Glutanimate.

Pressing Alt+Space will display the window submenu where you can redecorate - obviously this doesnt need a keybinding, but its nice to have a toggle option to quickly turn the titlebar on/off

I have just managed to invoke the Openbox' context menu on an undecorated window by right-clicking the bottom edge of the window. It's just that you need to right-click as soon as the resize cursor is displayed. The previous tricks did not work for me because there was a virtual Windows machine inside the window, so it was catching the Alt+space key combination...