Set inactive-window scrolling to your preference
Turn the Windows option off when wheel input should remain with the focused window, or on when hover scrolling is desired.
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Control the Windows setting that sends wheel input to an inactive window under the pointer.
If the wheel scrolls a background window without clicking it first, Windows may be applying its intentional inactive-window scrolling behavior.
Focus one window, move the pointer over the other without clicking, and turn the wheel.
Open Settings → Bluetooth & devices → Mouse and toggle Scroll inactive windows when hovering over them.
Keep focus on the first window and retest the second.
If the setting makes no difference, exit vendor or gesture utilities one at a time and retest.
Turn the Windows option off when wheel input should remain with the focused window, or on when hover scrolling is desired.
Disable only the confirmed application-specific or vendor mapping that overrides normal Windows behavior.
No. Windows can intentionally route wheel input to an inactive window under the pointer.
Microsoft Support. Windows mouse settings, including inactive-window scrolling.