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$\begingroup$I don't have 11.3 nor insight on this command but I've used MenuSetup.trhere and here, you may want to find the file MenuSetup.tr (although there were some challenges on MacOS) and look for the word RebuildHelp..., make the line comment as you do in a notebook (* *) and restart the Mathematica. I hope it helps.$\endgroup$
$\begingroup$@BenIzd: Thanks for your thoughts and suggestions, but alas the only MenuSetup.tr on my computer is 17 years old, buried deep in backup files, and hence irrelevant to my current problem.$\endgroup$
MenuSetup.tr
here and here, you may want to find the fileMenuSetup.tr
(although there were some challenges on MacOS) and look for the wordRebuildHelp...
, make the line comment as you do in a notebook(* *)
and restart the Mathematica. I hope it helps. $\endgroup$