Clicking it will shift you to the task view mode. In task view mode, all running programs will be lined up as large thumbnails.
[header] How to use multiple virtual desktops in windows 10 [title] Click (tap) the task view icon on the taskbar. [step] In the taskbar of windows 10, you'll see an icon to the right of the search bar that looks like a rectangle with two smaller ones slightly behind it (actually, it looks like a box with rectangular ears). This is the task view icon.