If you mean the application backgrounds in Windows 10:
Open the Settings App (gear icon on your Start Menu)
Go to Personalize - Colors
At the bottom of that settings page, set Default App Mode to light
If that is not what you need, please explain this in more detail, so I can help you . . .
Thanks again, but the problem is that clicking the LIGHT button does not do anything.The whole screen remains frozen. I tried to click it many times, but … nada
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