This was one of my least favorite designs in the VS environment.  When the Error List was split from the Task List, a row of buttons was put on the top of the Error List for users to customize whether they just wanted to see Errors, Warnings, or Messages.

For example, here’s the default with everything enabled.

Error List all views enabled

And now, here’s the Error List with nothing enabled for dramatic effect.

Error List All views disabled

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