It's actually two windows into the same workbook.

Select the window you don't want and hit ctrl-w.

Remember to save the workbook the way you like--or you'll be doing this again.

Bongo62 wrote:

When I open certain workbooks, it will open two copies of the one
workbook..:1 & :2. Why is this doing this and how do I get it to stop? I
know that I can simply close one of them but this just started happening and
I would like to know why.

--

Dave Peterson