Hiding and Protecting Workbooks
Sometimes you might want to keep certain information out of sight or simply protect it from inadvertent modification. You can conceal and protect your data by hiding windows, workbooks, or individual worksheets from view.
For information about protecting individual cells, see "Protecting Worksheets".
At times, you might need to keep a workbook open so that you can access the information it contains, but you don't want it to be visible. When several open workbooks clutter your workspace, you can use the Hide command on the Window menu to conceal some of them. Excel can still work with the information in the hidden workbooks, but they don't take up space on your screen, nor do their file ...