MS Excel
How can you show or hide the gridlines in Excel Worksheet

Go to Tools > Options > View tab and mark or remove the check box named Gridline
Both
Click Gridline tool on Forms toolbar
None

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MS Excel
How do you insert a row?

All of the listed here
Select the row heading where you want to insert the new row and select Edit >Row from the menu
Right-click the row heading where you want to insert the new row and select Insert from the shortcut menu
Select the row heading where you want to insert the new row and click the Insert Row button on the standard toolbar

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