Hide formulas from appearing in the edit bar
If you select the cell with a formula, it will be visible in the edit bar:
To hide the formula in the edit bar, do the following:
1. Select the cell(s) that you wish to hide the formulas for, right-click in it, and select Format Cells... from the popup menu (or click Ctrl+Shift+F):
2. In the Format Cells dialog box, on the Protection tab, check the Hidden checkbox and then click OK:
3. Protect the spreadsheet. To do this, follow the next steps:
3.1. On the Review tab, in the Protect group, click the Protect Sheet button:
3.2. In the Protect Sheet dialog box, on the Password to unprotect sheet box, type a password for the sheet, if you wish (Password is optional, for more details see Protect Excel spreadsheet options), and then click OK:
After that, the formula will no longer be displayed in the edit bar when the cell is selected.
See also this tip in French: Masquer les formules pour qu'elles apparaissent dans la barre d'édition.