Question

I know that I’m aborting the evaluation and can see it when the black bar on the side goes away. So there is no need for this message. How do I turn it off?

Answer 1

If you are not using $Post for something else, or if you can combine functions, you could use:

$Post = # /. $Aborted -> Null &;

Be warned that you may break things, as programs may use $Aborted in their control flow.

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More robustly, addressing the problem Alexey demonstrates:

$Post = Function[Null, Unevaluated@# /. $Aborted -> Null, HoldAllComplete];