To close a file (assuming that you have saved it)

Click on File

Click on Close

There is not normally an icon available on the toolbar for this function. You can close a file by using the buttons on the very top right of the screen. Notice two sets of buttons. The one set of buttons appear in the status bar (the first row of buttons); this set of buttons refer to the whole program and clicking the X will close the application program you are working in.

The second row of buttons relates to the document with which you are working. If you want to close the document, carefully click on the X in the second row (see circled above).

Note: You should normally save your work to disk before closing a program. If you do not do this, you will lose your work. If you have accidentally forgotten to save your work, Excel will notice this and you will be asked whether you want to save it. the following pop-up screen appears.

Click on Yes if you want to save the work. A save pop-up screen appears.
If you do not want to save the work, click on No.
If you do not want to close (exit) Excel, click on Cancel.