Upon launching Mathematica (v. 11.3) I always get the Messages window with "An unknown menu command token (RebuildHelpIndex)...", as shown below.
How do I eliminate that?
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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. $\endgroup$