
To resize columns, drag the right edge of the target column header.

To change a column’s width so that it displays its contents compactly in their entirety, do one of the following:
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Double-click the right edge of the column header.
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Right-click the column’s header and select Best Fit.
To change the widths of all columns so that they display their contents in the best possible way, right-click the header of any column and select Best Fit (all columns).