12.0.0 for Microsoft Windows (64-bit), and the autocomplete feature is a bit of a mess. In previous versions I used to be able to type
Ta and hit the
tab key, and this was autocompleted into
Table, an extremely useful tool. But now the ordering of the autocomplete suggestions is rather bad, for the first suggestion is
TableForm instead of
Table, and I see myself going back to fix things all the time. Is there any way to set up a preferred set of commands for the autocomplete feature? If this could be done automatically (say, order by frequency of usage) that'd be great, but even a manual choice of priority would be better than the current ordering.
I've just tried your exact example on Win10-64 and MMA 12 and
Ta + tab in fact autocompletes to
Table in my system. You may try deleting your autocompletion history.
You can find that here: