Insert a worksheet
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Select the plus icon at the bottom of the screen.
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Or, select Home > Insert > Insert Sheet.
Rename a worksheet
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Double-click the sheet name on the Sheet tab to quickly rename it.
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Or, right-click on the Sheet tab, click Rename, and type a new name.
Delete a worksheet
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Right-click the Sheet tab and select Delete.
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Or, select the sheet, and then select Home > Delete > Delete Sheet.
Source: Microsoft