I saw this answer that was given two years ago, but all I’m seeing now in the Options window is 
Where would the “Run on external console” option be located?
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The window you posted is the MonoDevelop preferences window.
What you need to do is right-click your project in the Solution Explorer (I believe that’s what it’s called), and select
Options.There, you’ll see
Run, withGeneralunderneath. On that page is theRun on external consoleoption.