The double boxes button in the top right of a computer window is the "Restore" button. It appears when the window is currently maximized (taking up the full screen). Clicking this button will restore the window to its previous size before it was maximized. Essentially, it toggles the window size between maximized and its prior smaller size. Here's how it works:
- When the window is in its normal size, the button shows a single box (maximize icon).
- Clicking the maximize icon enlarges the window to full screen.
- Once maximized, the icon changes to double boxes (restore icon).
- Clicking the restore icon shrinks the window back to its previous size.
This button is positioned between the minimize button (which hides the window to the taskbar) and the close (X) button in the window's title bar at the top right corner. The double boxes icon visually indicates there are two possible window sizes or states you can toggle between.
