Excel worksheets are often included in many different kinds of documents. They can be used for an array of tasks, such as analyzing data, preparation of reports and presentations, organizing projects, and more.
When you write a new Excel table view layout sheet, it is useful to insert the worksheet in the active table view so that it appears at the top. However, if you open another table view with other sheets already open or even if you switch to another tab in Excel than what you should close first (like a different workbook or a different workbook from which you opened this one), the old worksheet will not be "disappeared" from the active table view. In most cases, if your intent is to delete this old sheet from the active workbook's worksheet range unless there.