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Windows10 Taskbar Preview thumbnails appear at wrong size when using 125% or 150% display scaling
When you hover the mouse over a taskbar icon to preview an open window, if the zoom level is set to more than 100%, the preview thumbnail appears incorrect either too large and cropped, or abnormall...
If the fixes above don't resolve the sizing issue, you can try a workaround to bypass thumbnails entirely. By modifying the registry, you can force the taskbar to show a text list instead of graphical previews. This changes the behavior of the taskbar and might be a suitable alternative if you prefer a list view.