The output window has a drop down, as shown below, to move between various outputs views (or panes), like Debug and Build.  There’s a command called Window.NextSubPane that you can use to jump to the next output pane.

The command in itself isn’t that interesting, but you can bind it to a keyboard shortcut, maybe Ctrl+Alt+Shift+O (since Ctrl+Alt+O is for the output window under general development settings). 

Now you can toggle easily between debug and build in the output window using a keyboard shortcut.

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