To enable solution and advanced build configurations go to Tools -> Options -> Project and Solutions -> General
and check "Always show solution" and "Show advanced build configurations"

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If you want the drop-downs with 'Debug' and 'Any CPU' in the Standard toolbar. Then right-click on the Toolbar -> Customize -> Commands tab -> Build section and drag 'Solution Configurations' and 'Solution Platforms' to the toolbar.


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Now you see the standard toolbar as below

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