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Follow the given below directions to enable or disable inactive window scrolling feature in Windows 10. There are a couple of ways to open Settings in Windows 10, but you can either click Settings icon on the left-side of the Start menu or use Windows I hotkey.Step 2: Click Devices (Bluetooth, printers, mouse).
In previous Windows versions, you would need to click on the inactive window (Firefox in this example) to be able to scroll it.
Step 2: Navigate to the following key: HKEY_CURRENT_USER\Control Panel\Desktop Step 3: On the right-side, look for Mouse Wheel Routing, and create one (DWORD (32-bit) Value) if it doesn’t exist.