Maple worksheets and documents open in a new tab or a new window.  

You can open the current worksheet in a new window.  See Open Tab in New Window.

If your session is set to open worksheets and documents in a new window, you can arrange open windows in several different ways.

On the View tab of the ribbon, under Windows Management, click one of Cascade, Tile All, Tile Horizontal, or Tile Vertical.

Cascade arranges the open windows in an overlapping fashion that displays the title bars and approximately 1 cm of the left side of underlying windows, and displays the complete top window.

Tile All fills the Maple window with the open file windows sized equally.

Tile Horizontal arranges the open windows horizontally.

Tile Vertical arranges the open windows vertically.

In addition, you can select from all open worksheets the one that you want to activate, save, or close.

On the View tab of the ribbon, under Windows Management, click Worksheet List to open a dialog that lists all open worksheets.

Select a worksheet file name in the list.

To display the selected worksheet, click Activate.