Click whichever one you want to switch to. Move your mouse over each of those thumbnails, and they will highlight on screen.

To switch between multiple windows of an application, just move your mouse cursor over the icon, and thumbnails of each window will show up. A lighter background will be behind the window that is currently active, and if more than one instance of an application is open, you'll notice the edge of another tile tucked behind the icon. Programs that are currently open will look a lot like pinned applications, except there will be a thin line beneath them. Pinned taskbar items can be reordered just hold left-click, move your mouse, and release left click to put it elsewhere on the taskbar. Some pinned programs will provide more detailed launch options after right-clicking them, such as a browser that goes directly to a recent website rather than the default front page. Right click the program, and you'll see options to pin or unpin from the taskbar. Just about any type of program can be pinned here, or, if you don't ever use it, be unpinned. These are shortcuts to programs so you can access them immediately without having to go rooting around in the Start Menu or search bar. The other icons directly beside it are pinned programs. The File Explorer icon is a yellow folder that, when opened, will let you browse through the content of your computer. Learn more about how to use Task View here.

You can drag and drop active windows in Task view to the appropriate desktop easily. This means you won't have to keep one desktop overly cluttered with dozens of windows, and instead parse them out over several task-focused desktops. Here you can tailor-craft a desktop built for specific tasks, such as watching movies or editing videos. The really interesting feature is the New Desktop button in the bottom-left. From there you can click each one to view the open app, or the X to close it. Clicking it will shrink all of your programs so that a small thumbnail of each is visible. Task View is an imaginative way of managing your active windows.

What does lock the taskbar mean