It appears from the manual page that you want:

Style ThingIDontWantToClose !Button 2
(or whatever button # you have Close mapped to)

Mark

On Wed, Dec 11, 2019, at 7:01 AM, Tom Horsley wrote:
> I'm trying to train myself to leave one specific app
> running instead of clicking on the "close" button
> in the window decorations. (There is a bug that
> makes startup really slow).
> 
> Can I make the close button binding not do a close
> just for one app? (If I really want to close it, I can
> use File->Exit). Or even make the close button simply
> not be there at all just for one app?
> 
>

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