I'm going to answer my own question because I had a lot of trouble figuring it out. Yes, there is an "accept this answer" button, clearly visible beside the question and answer … but only if no answer has yet been accepted! I had a question which was answered (basically, "there's no easy way to do that, it's an OS limitation") but then another writer posted a useful workaround. I wanted to accept the latter but there was no "accept" button … until I clicked the "Unaccept" button by the first answer.
MATLAB: How does one accept an answer
accept answerunaccept answer
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