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Open the Render Setup window.
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Switch the Renderer to a render different than V-Ray.
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Revert back to V-Ray.
In 3ds Max it is also possible to reset Numeric Parameters to their defaults by right-clicking on the spinner icon:
To reset all settings to their default values, go to Render Setup > Settings > Reset Settings:
Then click on Reset:
To learn more about Resetting Settings, check out the article: Reset Settings at Chaos docs.