In the General Development Settings, the Error List will be shown (whether it is auto-hiding or just closed) whenever a build fails with errors.  If you like to drive what you need to fix using just the Output window (since you can double-click on an error message in the output window and jump to that line), here’s how to prevent the Error List from appearing.

Under Tools – Options – Projects and Solutions – General, there’s the Always show Error List if build finishes with errors checkbox. 

Always Show Error List tools option

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