The taskbar is a horizontal bar at the bottom of your desktop in Windows 11 that shows theÂ Start menuÂ ,Â Search,Â Task View,Â Widgets,Â Chat,Â File Explorer,Â Microsoft Edge, andÂ Microsoft StoreÂ iconsÂ aligned to the centerÂ by default. The taskbar corner includes theÂ notification area icons,Â Quick SettingsÂ (Win+A), andÂ Notification CenterÂ (Win+N) with the clock and calendar.
When you have one or more windows open for an app, you can hover over or click/tap on the app’s icon on the taskbar to see thumbnail previews of the open windows.
The taskbar will only show thumbnail previews of so many open windows for an app before the threshold is reached and will then afterwards automatically show a stacked list of the open windows.
Here are some default taskbar thumbnail threshold limits based on screen resolution with default DPI:
This tutorial will show you how to change the taskbar thumbnail threshold limit for number of thumbnail previews to show before stacked as list for your account in Windows 10 and Windows 11.