MS Excel
To center worksheet titles across a range of cells, you must

Widen the columns
Select the cells containing the title text plus the range over which the title text is to be enfettered
Select the cells containing the title text plus the range over which the title text is to be centered
Format the cells with the comma style

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MS Excel
You can select a single range of cells by

Dragging over the desired cells
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Ctrl key while dragging over the desired cells
Pressing the Shift key and an arrow key

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