Output Window, Debugging, Options Dialog Box
You can specify which types of debugging information appear in the Output window. To display these options, open the Tools menu, click Options, expand the Debugging node, and click Output Window.
General Output Settings This category contains controls that determine whether general debug messages appear in the Output window. You can specify whether each type of message appears.
WPF Trace Settings This category contains controls that determine the level of WPF trace messages that appear in the Output window. You can specify whether each type of message appears and specify a level ranging from Critical to All.
For more information, see How to: Display WPF Trace Information.
If you need to restore default settings, you can do that using Tools > Import and Export Settings > Reset all settings. If you only want to reset a subset of settings, save your settings in the Import and Export Settings Wizard before making the changes that you want to test, then import your saved settings later.