MS Excel
Long text can be broken down into many lines within a cell. You can do this through

All of above
Wrap Text in Format > Cells
Justify in Edit > Cells
Text Wrapping in Format > Cells

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

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
Widen the columns
Format the cells with the comma style

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