Solution Error Visualizer
This feature adds error, warning, and message squiggles to Solution Explorer. The information is fetched from the Error List and directly displayed in the Solution Explorer tree view. Hovering over the nodes with squiggles brings up a pop-up with the error/warning/message information.
You can filter the Solution Explorer to just files with warnings/errors/messages using filter dropdown in the Solution Explorer toolbar. You can create a new Solution Explorer view, filter it down to Errors and use it as a dedicated Error window. Note: Filtering the Error List by file scope (ie. Open Documents, Current Project, Current Document, etc) will not affect the display in the Solution Explorer.
You can turn off categories of squiggles or the popup in Tools > Options Productivity Power Tools > Solution Error Visualizer.