I’m using: SWI-Prolog version 8.4.1
Regards.
I found it in swish/lib/render.pl
With regards to my other reply on how I find code.
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this was found
(Note: The results in NotePad++ are color coded, each section can be expanded/collapsed, clicking a line takes one right into the file and at that line, the results themselves can be further searched, and the results can be selected and copied as text.)
Search "use_rendering" (27 hits in 9 files of 3433 searched)
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\examples\clpfd_queens.pl (1 hit)
Line 2: :- use_rendering(chess).
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\examples\clpfd_sudoku.pl (1 hit)
Line 2: :- use_rendering(sudoku).
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\examples\grammar.pl (1 hit)
Line 4: :- use_rendering(svgtree, [list(false)]).
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\examples\houses_puzzle.pl (1 hit)
Line 29: :- use_rendering(table,
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\examples\queens.pl (1 hit)
Line 2: :- use_rendering(chess).
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\lib\render\rdf.pl (1 hit)
Line 54: :- use_rendering(rdf, [max_length(100)]).
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\lib\render\table.pl (1 hit)
Line 132: % use_rendering/2, but we cannot distinguish this from higher up
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\lib\render.pl (14 hits)
Line 36: [ use_rendering/1, % +Renderer
Line 37: use_rendering/2, % +Renderer, +Options
Line 50: use_rendering(:),
Line 51: use_rendering(:, +).
Line 70: :- use_rendering(Spec).
Line 91: %% use_rendering(+FileOrID)
Line 93: % Register an answer renderer. Same as use_rendering(FileOrID,
Line 96: % @see use_rendering/2.
Line 100: use_rendering(Rendering) :-
Line 101: use_rendering(Rendering, []).
Line 103: %% use_rendering(:ID, +Options)
Line 109: use_rendering(Rendering, Options) :-
Line 119: system:term_expansion((:- use_rendering(Renderer)), Expanded) :-
Line 121: system:term_expansion((:- use_rendering(Renderer, Options)), Expanded) :-
C:\Users\Groot\Documents\GitHub\SWI-Prolog (Reference code for searching)\swish-master\lib\template_hint.pl (6 hits)
Line 134: no_template(use_rendering/1).
Line 135: no_template(use_rendering/2).
Line 344: rendering_template([ json{displayText: "use_rendering(+Renderer).",
Line 346: template: "use_rendering(${Renderer}).",
Line 348: json{displayText: "use_rendering(+Renderer, +Options).",
Line 350: template: "use_rendering(${Renderer}).",
The interesting point to note about the results is that use_rendering is used with SWISH and those that don’t code with SWISH would probably not know this. 
Yes. I don’t know swish.
I thought there were a particular package.
Thanks.