To unlock all cells in your worksheet, select all the cells by pressing the Ctrl+A hotkey or clicking on the Select All button (triangle icon present ... trying to lock file in Excel.

You can embed a PDF file into a cell of an Excel worksheet and then use Excel's security features to lock the object. This allows you to take advantage of both technologies. Embedding the PDF file ...

An icon in the shape of a lightning bolt ... t accidentally erase values or headings you need to have. How to lock cells in Excel 1. Select your whole sheet, done most easily by pressing Crtl ...